Pixar, DreamWorks, and Illumination are the largest studios that make animated movies these days and they all have such generic character designs now. Very soft, very round, large eyes, large mouths, and overall visually boring.
And they often have the same cliche actions and expressions.
I think you missed the point because he didn’t end up more miserable. He ended up better than he was, in little ways, sure, but in real ways. That’s the point of the show, that life isn’t some sitcom where everything gets wrapped up nicely.
There’s always more show (life). The characters keep living, Bojack continues to struggle, but every day, he gets a little better.