A lot of this also has to do with how they wrote Cahciua. Imo they overdid the "cheerful, cheeky freespirit who is right and the grumpy counterpart who is wrong" trope. I know the intention was that she/the game's narrative wanted to show how Erenville needs to get out of his shell more and not prevent himself from enjoying things/life. But the imminent death of his mother was really the worst time to do that.
It made Cahciua come off as selfish and self-centered, even though that’s not how I want to see her.
I know they love each other dearly but there were some hints that Cahciua wasn't always the best mother it seems. Such as her frequently going on adventures for prolonged periods of time and Erenville always crying when she left or her not telling him what his name means and he has to learn it from somebody else.
She felt like this kind of "can get away with anything, you just have to love them" character because she was deciding everything that was happening (in terms of their interaction) in that zone.
When during their final scene Erenville finally stood his ground and said exactly that, that she was deciding everything by herself and then just leaving him again (which indicates she regularly acts like this) I was happy because I thought finally his perspective gets some room. I didn't want them to fight or end on bad terms but I felt Erenville deserved to speak his mind. Then they could have made up. But when the story proceeded to treat him yet again as being (so obviously) wrong, I was really frustrated.
Throughout the whole zone Cahciua talked about her own dreams, how she wanted to see more of the world and so on. But at no point did she express that part of her dream also includes Erenville. Again I know she loves him but it just felt so jarring that the writers had her talk about herself all the time, what she wants and how that little adventure in the last zone made her happy, in front of her grieving son who literally told us he is being torn apart. It was peak insensitive. And she just went on and on about her stuff cheerfully. It felt so incredibly tone deaf.
Even worse, when she suggested to go on that little adventure and Erenville rightfully called her out how she couldn’t possibly ask him to do that, the story didn't follow along with his feelings. Instead it had Cahciua react like a mom whose moody teenage son is having a fit and she has to convince him to do something he normally likes. Erenville was framed exactly like said teenage son by standing there with arms crossed and saying "I suppose" after his mom asks him if he wouldn't like it if she bought him his favourite milkshake. There he is, opening up about how he just can't do this and the story is like "Come on, Erenville. You'll see this adventure is really good for you, you just don't really understand your own feelings like your mom does".
She does dictate everything in that moment even if the story wants to frame it as beneficial and Erenville as the one who "just doesn't get it". It has this patronising vibe of "yes your feelings are valid but if you just try it you'll see you like it! Don't be so dour, get out of your shell!"
So when they said their good-bye (which in itself was very touching and genuine) and the story had Erenville literally shout "Yes you are right mother!! I'll fulfill your dream!" with a very strong emotional subtext of "How could I be so blind? Of course you are right like you always are!" I just thought...but what about your dream, Erenville? And I get it, the implication is supposed to be that this is his true dream after all but the way they made him realise it by making it about Cahciua again, felt so diminishing of everything he felt and wanted prior to that moment.
I know this sounds like I hate Cahciua but I don't. Like I said, I know she loves him and I think it would have been really interesting if she was not a perfect mom. If they were family that cares deeply about each other despite their flaws and the story would have allowed this nuance to exist between them, resolving their tensions during her last moments.
But they wrote their relationship as totally one-sided, with Erenville as the one who literally doesn't get himself at all and needs his mom to tell him exactly where to go and what to do to figure out life ("go find the golden city/go to sharlayan", "go on this small adventure with me before I die", "go follow in my footsteps") and with Cahciua as the one who knows exactly what he needs, even when he thinks he doesn't, and whose plans always end up being just The Right Thing for him.
-----
Some thoughts about their first scene meeting in Living Memory because I don’t know where else to fit it:
I already disliked the beginning, when Erenville and Cahicua met for the first time "in flesh" again. For Cahciua it had been 30 years. For Erenville it was less but he came to the zone fully aware of his mother being dead.
The way Cahciua barely concerned herself with Erenville, let alone his emotional state, was staggering. They made her way too cheerful and had her focus almost exclusively on how to defeat Sphene, while she barely acknowledged the feelings of her son – whom she, again, hadn't seen in 30 years and who had just learned she was dead. Every concern of his was brushed off. This was even more annoying because before you go to the golden city, if you talk to Erenville, he’ll say that he wants to give her a piece of his mind after learning she’s dead. He never gets the chance to speak his mind though.
I would have expected at least a few earnest words of sadness, an awkward uncomfortable tension, some bittersweet expressions of how happy she is to see him again, or some heaviness/regret in her demeanor if she was trying to hide her true feelings behind a cheerful mask. But she seemed genuinely content. She controlled the emotional vibe of the whole encounter.
Especially annoying was that, when meeting Cahciua for the first time, they suddenly shifted the tone of the conversation and had Erenville do the "shaking my head/shrug" emote, which felt like they were having a casual conversation and he was just annoyed instead of him being full of deep, conflicting emotions upon seeing her. It felt so out of place.
And yeah, as some other people pointed out the rest of the group threw out some alibi “Oh Erenville”s but most of the time the issue wasn’t much of a concern for them either. So they just went through the zone, dragging Erenville and his inconvenient inner crisis along.