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I think that it's because asexuality is to sexuality as gender identity is to sex.
There's no consensus on what asexuality even is.
If it's a sexuality, then it would be the simple state of not being attracted to either sex, the direct opposite to bisexuality, and then it's fair to discuss oppression, invisibility etc.
If it's a spectrum of whether someone is sex repulsed to someone who only enjoys sex after having a deep connection with someone else, then the real issues here are misogyny and pornification, since women tend to be the ones that claim some form of asexuality over men, and the idea of "I'm asexual because I need to form a connection to someone else emotionally before desiring sex and can't just fuck a stranger at a club like everyone else" is the definition of a pornified society. That also means that it's not a sexuality and it's wrong to conflate it with sexuality.
I personally can't see how asexuality can be both, but hearing "asexuality and aspec identities" does sound just like a sexuality version of people calling themselves "nonbinary."
I really dislike radfems hating on asexuals. Not desiring sex is deviant from what is expected of society, whether among the right or the left (yes, even among radfems and it's quite obvious). There's a level of sex negativity that is encouraged in these spaces (don't have sex with men), but people taking it further upsets you (because you're a woman with the same desire for sex as the men you dislike). I will always support asexuality and acespec identities. If you want sex positivity in any form and don't want those "annoying asexuals" to bother you, just go outside. Stop acting like your stance on sex is not a mainstream opinion