Happy belated 7th anniversary to Arcaea

Even though the style of gameplay (i.e. inspired by SDVX) isn't as well-suited for me, especially with the need for multi-finger coordination in more difficult charts, I still recognize it for its place in the community-led evolution of this diverse game genre.

Spaking of its recent anniversarial update (4.0), what sorts of things do you either appreciate or didn't enjoy in it?