People that wanted this show to end with his suicide are missing a big point of the show. Life mostly doesn’t have dramatic endings, or gets wrapped in a bow.

Exactly. Just found this article, and this part puts it very well:

The punishment BoJack deserves for his sins isn’t that he dies. The punishment BoJack deserves for his sins is that he keeps right on living, but without some of the people who made his life better. They’ve cut him off. And he knows why.

It's not lucky that Bojack didn't die; he hasn't been given a "second chance." It just is. You hit rock bottom, only to find out later that there is rockier bottom beneath that ...