Intrigued by "This is not a solution for the majority of users." - do we really know what percentage was intended? If we're going by anecdotal, then everyone I

Intrigued by "This is not a solution for the majority of users." - do we really know what percentage was intended? If we're going by anecdotal, then everyone I know fully uses backspace to go backwards, including parents and non-technically minded colleagues. Would have assumed that if you go backwards by accident, the obvious solution is to go forward again, no?