Hyper OS is just MIUI rebranded so Xiaomi can unify the name for theit software used on phones, tablets, fitness devices, smart watches,etc. Despite claims that this is a new OS built from the ground up it's the same base code as MIUI so phone owners aren't going to notice any more difference than they would with a new MIUI build. Maybe Xiaomi felt left out since Huawei is rolling out HarmonyOS globally.