iOS and Android are already deeply entrenched in the mobile space.
So Huawei, wisely, decided instead of attacking them head on on their advantageous position, it would first start taking over the new industies which are wildly growing lately, IoT (IoE for Huawei).
After 2-3 years with more 5G applications coming up on the IoT space and more advances with AI, the Huawei would dominate this huge industry and then start leveraging this user base of its HarmonyOS to finally attack the mobile space.
IMO in 2-3 years we can draw some preliminary conclusion on how successful HarmonyOS has become.
This is a winning strategy for Huawei
As expected. I wrote something similar 2 years ago here