It's another one of those YMMV situations, I'm afraid. I was thinning and receding a bit before HRT, now it's coming back to where it was maybe 10 years ago (read: basically full or within normal/passable cis female range), but there are plenty of women here who needed some supplemented even after years of HRT. Plenty of ciswomen out there are in the same boat, I assure you.