I can't say I've experienced psychosis due to stimulant use personally, but I see what you mean. For me it's maybe brought on instances of hypomania a few times, but I get how it could trigger issues in others, especially in high doses.

My instances of psychosis outside of depression/mania tend to be triggered by stress. I don't use drugs or take any stimulant medications, but they still just happen sometimes. It sucks. I'm thankfully not in an active episode at the moment, but I do suffer on a daily basis from the "negative" symptoms of schizoaffective disorder (i.e., the symptoms that take away function, like anhedonia, avolition, alogia, etc).