If you follow the news daily and still consider Cisco hasn't proven to be worthy of skepticism at every turn, or reading the endless wave of "Chinese state sponsored hacker" news stories and never realize what the NSA is (EternalBlue, just as a quick read) then you're judging based on double standards.

This being said my main reason for being skeptic about HarmonyOS is that it's a v1.0. And just like almost all other v1.0s it has a lot to prove and improve.