Good evasion.
Now answer the question.
“(to wit: what percentage of Android users wouldn’t notice a difference if it was running anything else, or practically no serious OS at all?”
Why don’t you answer the question...I could just as easy turn this around on you and replace Android with iOS. Apparently you think it’s an accident that over 30% of smartphones out there are running Android? LOL, sure. It’s a riduculous question.