Even they're not exempt from being messed with. I had an HP color laser printer which, when purchased, would print on any paper size that would fit in the printer. (Specifically used it to print to US Legal Size.) A firmware update some years back disabled printing to anything larger than US Letter Sized.
I now own a Brother printer that is perfectly happy to print to larger paper.
I now own a Brother printer that is perfectly happy to print to larger paper.