But if you're successful despite a mental illness (by any measure of success), its worth celebrating that so others with that condition can see it can be overcome. And it'll help reduce stigma.
If you celebrate mental illness itself, fetishise it, blast out images of good-looking successful people with SHE'S BIPOLAR next to it, people will emulate it. It's fashion. It's what we do with everything.
The way mental illnesses are 'discovered' and grouped, as best as I can tell from what I've heard psychologists talk about it, is by a duck method. If it looks, talks, walks like depression, we'll call it that. The actual underlying causal networks are yet mostly mysterious, so they're not the basis of the defintions. The way they're defined is basically behavioural.