Long long time ago
Well, there was this sales droid, see. Or maybe a marketeer. Either way, he, she, or it is reported to have said "You don't want to get locked in to open standards".
There, in a nutshell, is the problem. The people who call the shots (a) don't have a clue, and (b) are focused on locking all the cattle in the barn where they can be milked with extreme prejudice. Any mention of common standards is taken as somebody else beckoning the herd to their barn, not a way to ensure the future of the human race as users of technology.
BTW the open standards we are talking about are from the Posix vs VMS era. Nothing changes.