There's no need to keep re-inventing the wheel. A hardened OS based on Android 11/12/ or 13 with all of the current security updates backported and oxygen OS s' app switcher "lock features" is what is needed
In an interview with TechCrunch, Carl Pei, the CEO of Nothing, talked about plans to build a custom operating system. Pei noted the market dominance of iOS and Android but says there's still potential for something different.