LQ said:
I just wish we used dickgirl instead of newhalf, but I guess that creates ambiguity.
Yeah, especially given that in English these days dickgirl can equally mean "it's just for girls with dicks, no vaginas" and "it's for all girls with dicks, including those with vaginas", so it'd be ambiguous with futanari (which is why dickgirl is aliased to it instead). As newhalf is treated as a subset of futanari (and futa being used as the term for all 'girls with dicks' art), any alternate non-loaded term for it would necessarily have a name derivative of futanari, ala full-package futanari.
But that brings in the point of focus. The reason why futanari is used as the umbrella is because in art, futa overwhelmingly emphasizes the dick over the vagina, because for a lot of folks the appeal is in what looks like a cis woman suddenly having a cock, and using it in ways only dude would imagine, especially if they have cocks bigger than their bodies and nuts fatter than a tanuki's. So it doesn't make sense to make a distinct umbrella that encompasses futanari and 'newhalf' separately, because the ambiguous cases would end up going to the umbrella tag anyway (ala Super Saiyan when you can't tell if the artist meant SSJ1 or SSJ2).
As such, if the focus of female futanari is that the female subject in question has a dick more than them having both a dick and a vagina, one can easily reason that the same applies for male futanari in reverse, that the focus is that the male subject has a vagina more than they do a dick. And searching the posts in male futanari, you see that's exactly the case - despite a penis being present more often than not, the focus of the art is directed more towards the vagina, whether it be penetration with finger, tongue, penis or creampie, etc, effectively just like 'cuntboy' (which also means you also have the opportunity for ambiguity, where a malefuta is depicted in a way where their penis isn't shown).
As Shining mentioned, it is strange that we don't have an umbrella tag for "male-with-a-vagina" despite giving "female-with-a-penis" that same honor, especially as you'd imagine there would be people interested in blacklisting the former just as much as they do the latter (and it wouldn't make sense to make a distinct umbrella tag for "male-with-a-vagina", because we didn't do that for "female-with-a-penis"). Given how much more niche the former fetish is, it isn't that surprising, but it does mean that anyone interested in it is forced to do ~male_futanari ~cuntboy to get what they want.