>>150968922 (OP)
Two factors not discussed by
>>150969903 ,
>>150970244, or
>>150971524 fully:
1. Tiny Toon pulled much more from Looney Tunes than Animaniacs did. Not only was it a similar tone and was general also a fourth wall breaking, irreverent slapstick comedy but most of the character archetypes and a good portion of the plots and gags are directly borrowed from Looney Tunes. Therefore, many felt am still feeling the show to be an inferior knockoff of Looney Tunes. Animaniacs meanwhile, features more characters, archetypes, gags, and plots that aren't blatantly borrowed from old theatrical cartoons. Even someone like Slappy, who clearly is inspired by Screwy Squirrel, has quite a bit to differentiate her from him in a substantial way.
2. Besides being experimental, season 1 (and possibly extending later) of Tiny Toon had a production that involved a power struggle where Spielberg, the HB people coming over from A Pup Named Scooby Doo, writers that came from the Groundlings, and New Mighty Mouse cartoonist alum among possibly others were each trying to make the show their own to some degree. The end result, solidified by Animaniacs, saw the Spielberg/Ruegger cartoons become writer driven affairs with the HB and Groundlings alum generally prevailing, Spielberg taking a backseat creatively, and the New Mighty Mouse alum mostly migrating elsewhere (a lot of them to Ren and Stimpy). This process solidified the identity, stylings, tome etc. of the Spielberg/Ruegger cartoons.
>>150974242
Eh, I would say Buttons and Midy is more immediately inspired by the Roger Rabbit and Baby Herman cartoons (Spielberg was a major part of Roger Rabbit) but with two major differences that made it quite inferior; the animation is significantly weaker (not helped that most shorts were farmed to Akom and Freelance) and the guy chasing the baby, instead of being a klutzy talking animal who behaves very human, doesn't speak and is treated much more like an actual pet animal.