if it ain’t broke, don’t fix it
- Leave something alone; avoid attempting to correct, fix, or improve what is already sufficient (often with an implication that the attempted improvement is risky and might backfire).
- I know it’s an ugly looking antenna, but you know what they say: If it ain’t broke, don’t fix it.
if something is reasonably successful or effective, there is no need to change or replace it.
"Stick with the plan! If it ain't broke don't fix it"
c2.com/cgi/wiki?IfItIsWorkingDontChange Many people advocate that if it is working, you should not change it. ... An engineer says "we need to repair the bridge; it's showing its age" and the manager says "it's still working; don't change anything"? ... If there are developers and managers that committed to believing that a broken process is working, it might be time to ...