
This is a common misconception- asexuality is a sexual orientation, not an issue of libido (you can be any sexuality and have high or low libido). Grey-sexuality or asexual spectrum identities (if people choose to identify with one, it’s true lots of people might have that kind of experience and never identify it as asexuality) are referencing the idea of asexuality as a spectrum, are still describing their experiences of attraction/orientation not libido if that makes sense
There’s a lot of little pieces of sexuality that can vary in strength separately. Sexual attraction to someone, romantic attraction to someone, actual desire to have sex with someone, and actual desire to have a close relationship with someone are all separate things, even though they follow each other somewhat closely in many people outside the aro/ace spectrum. People have created different labels signifying which of those work differently for them.
asexuality has nothing to do with sex! it has to do with not experiencing sexual attraction. like for example if you're a straight man you don't experience sexual attraction to women, it doesn't matter if you like anal sex that has nothing to do with your sexuality. asexual people experience no sexual attraction to anyone, someone asexual may still enjoy sex because all the sensations are still there it's just that someone's looks do nothing to amplify the experience
I can't really speak for them as I'm asexual, but to my best understanding people identifying on the asexual spectrum is still an important part of their identity since they still live the vast majority of their life experiencing the world as an asexual person would. I think it's similar to how someone may identify as a lesbian because they've only been attracted to one man ever in their life
for example, someone who occasionally gets crushes on people where they experience strong romantic attraction for a short period of time, but never really has consistent romantic attraction, might identify as somewhere on the aromantic spectrum to signify their difficulties with romantic relationships, even tho they aren’t completely aromantic. That entire explanation isn’t included in the label though ofc, so talking to potential partners more is always a good idea