"coming out the closet" is an ongoing, continuous process? people can be out to friends but in the closet around family, people will re-closet at family events, people will be closeted at work even if they're out to family? There's a myth that once you come out, you're out, but anyone who's ever come out before knows that that's not true, but it's still useful as a term?
and the closet wasn't only ever for gay people (and you can be "clocked" as gay/lesbian at the grocery store, depending on where you live and what you wear and what mannerisms you have)-?
I'm not saying "boymode" never had its uses when discussing "i need to go to the store and not get harassed and I don't feel safe so i'm going to dress masc/lean into be read as a boy" but I feel like with the way I've seen it used now it's become a sort of brainworms enabler. Girls are thinking they "boymode" when they just look like some woman in a pair of jeans. The culture around "boymoding" seems to encourage girls to stay, well, in the closet (this is not to say that anyone should risk her own safety if she feels like presenting fem would endanger her, to be clear).
And I'm not really sure about the transmasc thing, I'm pretty sure there are transmascs who closet and/or re-closet ("girlmode") depending on whatever situation they're in, and "masc-presenting" pre-social transition is just .... getting misgendered while wearing pants (and getting attacked for being perceived as being a lesbian depending on one's exact location + appearance). "masc-presenting" pre-medical transition is also anything from wearing pants (and getting misgendered) to risking getting attacked for being perceived as lesbian or as a trans man.