It is a shame that those companies don't contribute to AOSP (or fork it). Apparently Huawei decided that they would do better alone with their own HarmonyOS, but I don't get it. It could be so powerful if AOSP was actually shared between the Android manufacturers...
I would happily leave Android and go with such a fork. Instead, each (Samsung, Huawei, ...) try to make their own thing. And good luck to them to beat Android on their own.