I assume that Hawai OS has limited apps compared to applestore and googlplay? or how it works?
It's called Harmony OS and in tests & reviews he does significantly better than Android. Faster, smoother and less battery consumption for example.
So far it's limited to Huawei devices sold in China, so I don't have first hand experience. However, installing microG services also works, so 98% of Google services are working (except McDonald's, Google wallet and Google car). Today HarmonyOS is still 100% compatible to Android.
Global devices still run Android and emui.
However, Huawei's plan is to completely ditch Android. Then most Android apps won't work anymore. As of now App availability is still limited, especially for apps popular in the West. In China there aren't such constrains though.
It will be interesting, if more Chinese phone manufactures (Xiaomi, oppo, vivo, OnePlus, realme) will jump on the bandwagon and also use HarmonyOS instead of Android in the future, which will be major blow for Google. Then more and more developers will also provide Apps for HarmonyOS.
If trade tensions between China and the US will deteriorate further not an unlikely option.