Completely hypothetical, of course cough
But what if you put a decal on, had decal set, microsol, man it just laid down and stuck so nice, and an hour later you get to looking and have a homer simpson <doh!> moment and realise its very wrong in placement. Do you say artistic license, I always meant for it to be there, or is there some way of removing it so that you could actually re-use?
Honestly, nobody is gonna notice or care unless they’re also a modeler and savvy with these sorts of things. I think I care enough just out of principle I’d attempt a fix if I thought there was any chance of pulling it off, no pun intended.