Except IT does that all the time in most companies. You don't get to choose your own OS. You have to use Outlook and Teams in most windows shops. Good luck getting approval for an Office alternative.
I wrote a fairly opinionated screed here but opted to delete it after I thought about it. I think I can summarize pretty succinctly: The business guides IT. Often cost reduction is the order of the day and, to that end, monocultures usually win out.
