#1 and #2 ignore why a rewrite is happening in the first place. No one rewrites a system for fun, they're rewritten because the current codebase has major faili

#1 and #2 ignore why a rewrite is happening in the first place. No one rewrites a system for fun, they're rewritten because the current codebase has major failings that prevent new features or make the current codebase unworkable. These should be the first things added to a rewrite to prove that it's not a wasted effort.