Often doing the stupid thing is the right thing to do, instead of thinking hard to do the smart thing that ultimately wont be needed and will be harder to understand.

So juniors thinks twice before doing stupid simple stuff. Intermediates thinks twice and does smart stuff. Seniors only does smart stuff where it is needed and does the stupid simple stuff without thinking in most places.

when the expert thinks twice they don't do something stupid?

"It's common to become very good at doing it badly"