One somewhat minor thing I've noticed that I wanted to add to this thread: HRT may have a small effect on how long the shedding phase lasts, since spiro + some form of oestrogen (Estradiol for me) will often have an effect on body hair growth. I'm not sure if this affects how quickly hair follicles grow in. However, my last laser session was the first I've had while being on HRT (just entering my second month of HRT, and on my seventh laser session), and it does seem like the individual hairs on my face are taking longer to be pushed up so that they can be shed, which has extended the shedding phase for me by a little longer. I may be imagining it, but it feels like the hairs are taking an extra half-day to a day to appear, whereas it was much more consistent before I started HRT.
The negative effect of this is that, though I have very little facial hair left, the small bits of greenish shadow have been lasting a little longer than I would like them to. Again, I'm not sure if this is due to HRT, especially since I'm so early into it, but it's definitely the first time I'm noticing the hairs behaving in this way.
It's also a little frustrating because HRT makes your skin smoother, as has begun to happen for me, and I find shaving has to be done more delicately than before; it hurts a little more to do it, and I've nicked myself more than usual.