Bocchi the Rock!
I don't know who decided that a 4koma should get some of the most inventive and expressive animation of this decade, but they're a fucking genius.
I only learned about it from seeing a webm of the Blender scene, and I thought "ok, this is kinda hilarious, I gotta give this a shot." I was watching happily until episode 5, when I thought "wait, are they gonna play the whole song? They are aren't they. Wait a minute, this song fucking rules." And every single episode after that was banger after banger. One hilarious bit, stylish animation cut, and kickass song, one after another.
As an aside, I watched My Dress-Up Darling season 1 before Bocchi, and watching season 2 now, and you can tell how much Bocchi the Rock influenced Cloverworks. Season 1 had good animation, but it was fairly standard. Season 2 they've been much more experimental and it has been a joy to see it all.