Some of this things is not working wi-fi adapters, printers, laptops, graphic cards, sound cards, e.t.c. (not mention that computers must from time to time make some production for owner, not just conctantly solve installing problems) Yes, I know, it's not fault of Linux. Otherwise Linux is perfectThere is very little that can't be done with Linux these days.
What do you do when you installed Linux in your whole office then found your printers don't works? And never will? Pay attention that I don't even tell about applicatons functionalty yet. Just about devices.