Honestly,
any of Ayu's "ending" songs (yes, including Beautiful Day and Thank U) strike me as really emotional, but I feel like I'm alone in this

I find them to be beautiful in their own way, and I do feel something well up inside me when Beautiful Day, Replace, Thank U, MY ALL, etc. come up. They've all got a kind of nostalgic, yet satisfying feeling.
Idk, I can see why there'd be a split over a song like HONEY or Beautiful Fighters (shameless sugary pop songs), but I never got all the hate that songs like Beautiful Day, Thank U, and the other songs of their kin got

So I'm with you there.