> Has the term trans grown beyond just (for lack of a better term) those with body dysmorphia?
As far as I am aware, no. But bear in mind that there’s not always an abrupt transition between gender-associated behavior, due to social circumstances beyond personal preference. High School, a setting which implies an age where parental figures retain overwhelming leverage over minors’ lives, is a fairly good example. E.g. clothing choices at home are open to parental scrutiny, whereas pronoun use at school is not.
Beyond that, though, like any term that is applied at one’s own volition and in response to subjective internal cues, there is going to be some variation in the folks identifying that way. Not in a “liar” sort of way, just in a “there’s no precise cut-off on what behaviors or feelings constitute trans” kind of way.
Especially as social stigma decreases or, depending on one’s precise social micro-environment, possibly even turns into a form of social prestige. Again, without any deceit intended, you can imagine that someone that feels they fall in a gray area and needs to explore their identity may verbalize (or even conceptualize) that feeling differently based on the quality and magnitude of social connotation.