"Most of vim is from vi" doesn't mean it is same. For Vi != Vim to be wrong (or Vi == Vim to be true) everything that Vim provides MUST work with vi as well - o

"Most of vim is from vi" doesn't mean it is same. For Vi != Vim to be wrong (or Vi == Vim to be true) everything that Vim provides MUST work with vi as well - only then they are same/equal.