He made some great, unique stories too though, precisely because he was so daring. It was a double edged sword, but Bluth's classic movies wouldn't be so uniquely Bluth if it weren't for his attitudes. If you watch something like Land Before Time or Secret of Nimh, it has a very different vibe than something by Pixar or Dreamworks, or even the darker Disney movies.
It's fascinating because a lot of his stuff has that extra darkness and grit, but it never feels like it's trying in that "edgy" way that makes stuff like Robert's proposed reboots so cringy. It all feels completely natural and organic for the worlds he made.
In fact, it was when he tried to go lighter and softer that resulted in some of his worst stuff, like Rock-a-Doodle or A Troll in Central Park.