Absolutely agree with another poster that it's something I often strongly wish I didn't have. I've dated only one long hair women before (hottest person I've dated by a mile), while I have mostly dated women with medium or short hair, but the thought of being with them long-term was singularly dismissed due to my long hair fetish. Also had lots of female platonic friends that went from 5s or 7s to 8s or 9s after growing their hair long, and this has often led my physical attraction to them to dramatically changing accordingly, which I at times felt put a strain on our otherwise platonic friendship.
I think it would be unfair to impose rigid restrictions such as "never cutting your hair" or "grow your hair long" on a woman in a relationship. I don't unilaterally decide how they dress, so why should I unilaterally decide how long their hair is? This is why the best compromise is to find a partner you mutually agree on these terms with, but such women are few and far between. For this reason I've had very few romantic partners, which has stunted my love life and prospects of being in a long-term relationship, so it is what it is. People with other fetishes such as armpits or feet have it much better imo because A) all women have them (well in the case of feet there may be the unlikely case of an amputee here and there) and B)those body parts are less likely to be "manipulated" or changed like hair. I think this is why hair fetishists like me rely so much on webcam girls or online creators etc. It's a fetish that isn't very "naturally occuring".