If I disregard "/s", I actually agree - with caveat that large refactoring is still ok if you treat the refactored code as a totally new project - not battle te

If I disregard "/s", I actually agree - with caveat that large refactoring is still ok if you treat the refactored code as a totally new project - not battle tested that is. So you absolutely can do large refactorings, but the resulting code should be thoroughly tested before deployment.