I am trying to think of other older examples, but I know I have seen it before Workspaces/Chromebook:

The upstart adopts all the keyboard shortcuts of the dominant player. Then the existing userbase is comfortable... compatible, with the new and different software.

Then, slowly but surely, new novel shortcuts are introduced and you gradually find the “compatible” ones vanishing or conflicting or just glitched, until one day you’re no longer capable of using Apple or Word or Netscape or Excel.

I propose that IBM saw that coming, and fought against a future where IBM-trained users easily adopted someone else’s apps.