The only reason it wasn't a big issue was because it only jumps to cellular data when wifi is weak or network speeds are slow. This means most people when home, would only notice this when out of range. This typically only happens when people are leaving home, or if their home network loses connectivity with the internet. Since this isn't an every day thing, I would say majority didn't even notice.
Since 9.0 was only out for 7 or so days before 9.0.1, we may never know how big of an issue it could have been for users, I would assume that 9.0.1 changed the indicator issue.