I like Ascians in MSQ up until 5.0, and here and there when they have been meddling.
I am getting a bit tired of the shift we had since Emet Selch were the game tries to give them a bit more depth and while it did work on Emet, I think it fell flat for Elidibus or the Mitron Loghrif bit we had in Eden. I have absolutely no interest in neither Zenos nor Fandaniel right now, so I'm only curious about the end of the Hydealyn / Zodiark story and that's about it.
I don't think FFXIV will have another big story ark running for multiple expansions, and I'd be far happier with smaller self contained arks that last for an expansion. They aren't that good with keeping long plot points updated (Elidibus and Zenos mostly) relevant, but I love the little story bubbles like 5.0, or 4.2 / 4.3 with the end of the Doman storyline.
The Ascians honestly felt lackluster in the whole 2.X to 4.4 (or 4.5 ? when we learn about them being behind Garlemald in the first place), sometimes tying them back in because they weren't involved for some time felt a bit awkward (understand : all scenes with Elidibus mumbling on the moon, shaking his fist to hydealyn). I was very disappointed to see them appear in Eden, I felt it was lazy.