I consider this a positive, personally. People on this forum have spitballed how you possibly could have the WoL take a smaller and less central role, often from the perspective of trying to de-power or kill them, which feels like it solves the problem but doesn't really, because the problem is kinda inherent to the gameplay, you can't just say 'this character's weaker now' and expect it to work. It's a hard solve; how do you keep a story about one singular blank-slate protagonist interesting, when they just keep getting stronger but don't exactly become less of a blank-slate.
I think this takes a clever angle, of instead pivoting us into a different role, that uses our history and presumed strength level without just making us the protagonist. We're taking a mentor role, we're the Auron to Wuk Lamat's Tidus (and please don't try to find a Yuna in that metaphor, it will NOT work). Teaching someone else how to take on the role that they strive to attain, using similar tools to our own. If anything I think we could've served to be de-emphasised more, just because while Wuk Lamat clearly did need our help to get inner strength and confidence, as well as a hefty sword arm that she didn't necessarily have early on, it could've served to have someone else take a role in teaching her political leadership. That's a harder role to fill, though, since all the politicians we know are busy, y'know, being politicians. Alphinaud spends the entire expansion doing basically nothing, his skillset is politics-adjacent, maybe he could've taken that role?
That kinda does by nature involve putting a lot of eggs into the one basket, though; a story primarily about a silent protagonist and their mentee is gonna require said mentee to shoulder a lot of the storytelling weight. That's inevitably gonna not work out for some people, because there's no such thing as a universally beloved character, but I actually don't think that's a new problem for the game; Heavensward and Stormblood put a lot of weight on hoping that Estinien and Lyse got over with people. I'd argue that most of both Shadowbringers and Endwalker actually hinge a lot on you liking specifically Emet-Selch and his story, and he isn't even necessarily a very big character in terms of per-scene presence. I also don't necessarily think that's a flaw, though; FFXIV's story is inherently very character-driven, and everyone has different tastes on what they like in characters, so having a polarizing character sorta just means you did the job right. It means the character is strong enough to provoke opinions and feelings.
Genuinely, I would argue that there's really popular FFXIV characters that couldn't handle the sort of spotlight Wuk Lamat does, because that requires a character to be vibrant and multifaceted enough to remain interesting during the entire spotlight. Harchefaunt, Aymeric, Hien, they couldn't remain interesting across that much time. Most of the Scions couldn't manage it. Hell, their prominence in the expansion indirectly sort of shows that Krile and Erenville don't have strong enough personalities to carry an expansion.