Why?
Because i despise that term? I hate that everyone missuse it as a generic term to describe any guy remotely feminine looking? Even thought a femboy is literally JUST a boy that look feminine? That means short hair and boy clothes. In some subcases, thicc. And a decent part of the actual people that call themselves as such, are attention wh###s, clingy and toxic when not given attention?
So i don't want to be given that term in any circumstances.
To further the first point. A crossdresser is not a femboy. A crossdresser is someone that enjoy dressing up as the opposite gender. It may sometimes involve wearing wigs or growing their hair out, and even using make up to look the part.
A trap is someone that look naturally as the oposite gender or could pass as both, leading to confusion. Etc etc.
honestly, "trap" is kinda a harmful term if your really think about it, femboy is just a term that it is overrated and to describe any guy looking feminine, as you already said it, but trap is a really annoying term too, it has a feeling that a person is making another fall in a trap, misleading them, lying to them.
trap is only harmfull because some dumb snowflakes decided that because in some country, trap is used as a slur to harm certain type of people, therefore it's a bad word. But allegedly, sure, so long as it's still not femboy i'm fine with just crossdresder or what not else xD
And technically yes and no, traps also design people that are just naturally, genuinely in between both genders in terms of looks and could easily be misstaken as either. But for those there used to be another term that i forgot with time. Something something hime something