I used to have a dwarf angora. I don't have much to add to what Shimmer said, but one thing that angora fur does it that it felts really easily, by which I mean that the fur will stick together in thick felted mats that can cover a significant area of their body, even all of their body, if you don't take care of their fur properly. This is really painful for the bunny , will cause skin damage, and will even restrict their ability to move. Having a long-haired angora bunny outside in the rain is asking for trouble. At the same time, having a long-haired angora bunny outside in the sun is asking for trouble as well, as their fur is very warm and they overheat easily. Honestly, I think it's in the bunny's best interest to keep their fur short all year round so it doesn't trouble them, they don't need lengthy brushing sessions, and they can keep themselves clean (very important to clean animals like bunnies). Of course, if you want wool you'd probably prefer to let it grow long before cutting it, but I personally don't think it's ethical to do that just because you want their fur.
I don't think angora rabbits should be bred, to be honest, as their fur causes them nothing but trouble. If you want wool, I'd just buy it from someone who treats their sheep well. You'd also have to consider if you can give this bunny all that they need: a large enclosure, a bunny friend, and vet care when they need it. From posts you've made in the past, it seems this is something your current bunnies aren't getting, so, and I don't mean this unkindly, you might want to focus on improving your current bunnies' situations rather than adding another bunny.