Rewriting is a misleading metric. You might not rewrite the bad code because (a) there is worse code to fix or (b) sales features are prioritised over bug fixes

Rewriting is a misleading metric. You might not rewrite the bad code because (a) there is worse code to fix or (b) sales features are prioritised over bug fixes. There might be other reasons. Also good code might lead to rewrites as a step in the right direction refactoring wise might encourage other improvements.