What's the point with that quite lackluster story in Endwalker?

[Xirean]

The lore EW presents on memory is unfortunately not particularly clear, especially as Montichaigne who articulates it is discussing two different theories of the soul, i.e. one whereby it's dissolved and re-assimilated in the Aetherial Sea so that new souls can be born, and the other focusing on what actually happens in the setting, i.e. soul rebirth (by all accounts, the correct theory, and G'raha takes it a notch further by positing that souls have intrinsic behavioural propensities.) On the one and, he states memory aether is not very susceptible to change; on the other, he says some events can imprint on the soul indelibly. I don't think he is presenting too certain an understanding of it, and my suspicion is that which theory you subscribe to has implications for what you believe happens to memory aether. Amon himself notes that he always had dreams of his times in Elpis, which he blames on Hermes's attempt to suppress his memory having the opposite effect on the memories. Text on the Convocation crystals varies between EN and FR, in that the latter states they're intended to revive memories. Equally, throughout the Eden quests, both the notion of imbuing and reviving memory are brought up, and by all accounts, the crystals are preferable as a method to what Mitron uses, i.e. the Ascian prime merger. IMO, it is plausible that germinating the seeds of a few imbued memories will suffice to begin restoring further memories, particularly as the subconscious reflects on them and tries to establish context... it may just be a case of how deeply buried in the soul they are. Either way, the lore here is more a case of just-so stories than firmly established and detailed fact, so I think both interpretations are valid.

That's fair. I mostly take the scene in Sharlayan a bit more seriously as it seems implied to explain why Emet knows what is going on in UT. As far as how memories actually work, more info is required. Either way, I don't think it is morally acceptable to try to overwrite someone with the memories of a previous life, without consent. Another thing to consider though about Gaia is that she is presumably Loghrif's first reincarnation after dying. We know Amon is a reincarnation of Hermes but we don't know for certain how many more lives that soul has lived. The WoL for example doesn't get memory flashes from Azem. The closest is echo visions of people we are talking to in that moment. They also don't get visions of other previous lives. If presented with memories from them it would be interesting to see how the WoL actually recalled those events.

Again, i being up Zenos as proof. As for parasitic, his lovers soul is still in there. He’s fulfilling the promise both of them made to each other. It seems the only thing tying gaia down is ryne lol, not even anything about her past without amnesia. The problem is one is existing at the expense of the other, and personally i see it as 2 people being happy is better than 1. He’s simply undoing the tragedy that occurred via the sundering, i’d say he has every right to do it. The sundering wasn’t a good act, and it created broken fractions of people. He was merely trying to put her back together. It’s no different than us picking up our shards.

There's a lot about Zenos we don't know. There's mention of him being experimented on and then he gets the artificial Echo and more weird stuff happens. I'd need to see specific lines from/about Zenos to see that point more clearly. Either way he is one guy and his circumstance is difficult to count as a standard one. As for Mitron and Loghrifs promise. That doesn't give them the right to Overwrite Gaia. If the WoL made a promise to Alphinaud and he died and was reborn, it would be horrible for the WoL to try to take that new person and turn them into Alphinaud. I don't think the sundering was a good thing either. I'm not pro sundering. I'm pro who is alive right now. Currently that is Gaia. Loghrif is dead and as far as we are shown, there is no way to bring her back without hurting Gaia. That is NOT ok to do. I also don't want to see the WoL going around and getting other Azem shards. Those shards are people with their own lives. For the WoL to make that person a part of themself would kill that person. That's murder and it's disgusting. I stated earlier that I didn't want Ardbert to merge with the WoL. He chose to do so to save the WoL and only chose to do so when the WoL was about to die. If that wasn't about to happen I doubt he would have done it.