First, they rush out a new Pokémon game every year now to keep up with the series and that pretty much put a sour taste in everyone who still purchased Scarlet and Violet.
And now we have endless fillers that make no sense half of the time like why can't Kishi let his pride and joy just series die already?
Filler Arcs were also more interesting to watch than waiting for seasons. The Bount Arc in Bleach for example is better than some of Bleach's worst Arcs (The Quincy War Arc, the Fullbring Arc, and even the Fake Karakura Town Arc).
not sure i prefer the constant airing given how severe the work conditions were for staff and how much it impacted animation quality, also can't remember any filler arcs that were anything better than mediocre besides some funny ones
art styles in anime before the 2000s were definitely much better though, generally at least
The last new anime I watched was Edgerunners, before that it was Goblin Slayer back in 2018. Everything else was just an adaptation of a manga I already read. There's way, way more series out now than there were back then, but I have a much easier time watching and enjoying a 25 to 50 episode series from the 90s or 2000s than I do a 12 episode series made today.
But maybe I'm just biased because that was the type of anime I grew up watching
Hard to say. It's more like, generally speaking, anime hasn't moved forward as a medium much but has instead side stepped. Decade old series and movies still stand at the top. People outside the anime bubble laud modern directors like Makoto Shinkai, though.