I am not against Huawei or HM OS. Its the probability of other Chinese companies moving over to new OS which I feel has zero probability. Huawei has no option but to develop its own OS and from what I have read its based on stock Android OS for which they dont need Google's permission anymore. So yes programmers might not have difficulties doing programs for it.
The problem with such OS is, it wont have google support. Chinese might have Beideu for their search engine, maps, playstore, and some social media apps. But Huawei or its OS cannot work with Google, its Map services, playstore, Google play music, Gmail, Whatsapp, FB or twitter or US companies social networks. Whatever Huawei does anymore, its devices nor its OS can work with these apps as support will be withdrawn. Its new OS has to go through approval process again in many markets in Europe, India and many other countries again consuming considerable time without having all these important apps.
It would be interest of global community and Huawei to stop this bickering and do some co-ordination with US govt on this issue. Huawei also needs to come clean on its shareholders pattern.