Lesbianism is certainly the iffiest, as I have seen too much circumstantial evidence in real life to point towards a lot of purported homosexual women being on advanced bisexuality. Though for the record I don't believe anyone is fully one thing or another, to the point of Witches, where sexuality, as a wholly personal phenomenon, has a difficult time being cleanly categorized. Aside from leather bara types, I believe they are wholly homosexual, and I respect them for it.
"Lesbians" describe their attraction to women in the same way a gay guy does who's trying to convince himself he's straight.
If you want a demonstration of the general principle, look at the portion of radfem BP posters who minimize yaoi as a cause of poonerism.
That kind of obfuscation is an extreme manifestation of the natural female instinct to control access to their sexuality—even to the point of pretending that it doesn't exist—as a form of soft power. The instinct itself isn't bad: it's necessary. Women need an instinctive mechanism to completely shut down interactions with weirdos. There are people that women are absolutely right to minimize their own sexuality around.
But here, it's twisted into a sort of deranged extreme.
Political lesbianism is the best example: in principle, all men are put into the "weirdo" category. The protocol is to treat all men as what manosphere types might call "invisible sub-7's": total cucked emasculated nothing-persons. Lesbianism as a pretense accomplishes that, so that's what political lesbians convince themselves that they are.
But it's not true, of course: they have sex with men anyways and find some kind of in-lore justification for it. The same goes for pooners: you'll be hard-pressed to find a pooner who doesn't have fantasies about getting "misgendered" and impregnated in a sun-dress. Asexuals have sex, but "that doesn't mean they experience sexual attraction".
I'd go so far as to say that it's the
most psychologically feminine women who pick up these "queer" sexualities and identities, because they're the most beholden to this instinct. It's all lies and it probably only deters naive younger men and autists.