I am an aspiring psychiatrist and I totally agree.

Looking at the way society behaves towards gender dysphoria now and the way it did before illustrates your point. I the past they would have lumped them in with those suffering from schizophrenia and even given them medication that would have altered their mental state.

I think the key is stability and functionality. Those who have Bipolar affective disorder also have hypomanic states where they can hyperfocus on a task while full mania makes the person interested in following any that appears to the end regardless of what it is.

Really insightful post!!