Chesterton’s fence is one I come across a lot. People see some confusing or not ideal code and immediately want to remove it, without understanding its purpose. I like stating it as “don’t assume the previous developers were idiots.”
Candidates would also have more information. They would have information about current employees and they could compare against their coworkers after they join.
https://en.m.wikipedia.org/wiki/Wikipedia:Chesterton%27s_fen...