So if making it cross platform "won't work", this is not about what won't work, but what is cheaper?
Since the OP kinda mentions gaming, let the customers fiddle with their wine installs and steam decks and spend the time on adding more loot boxes instead?
Yeah I don't buy that at all. He says "9 times out of 10" and then gives MS Office as the proof? MS Office is the 10th time out of 10, not the 1-9.
I think they absolutely could have made Office cross platform (it doesn't really do anything you can't do in Qt), and also the fact that they forked it and made two entirely separate sets of apps has pretty serious consequences. The feature sets are surprisingly different. E.g. you can add PDFs to documents on Mac; not on Windows.
Most software can be made cross platform (as long as you don't explicitly prevent it by using a platform specific GUI toolkit or whatever).
So if making it cross platform "won't work", this is not about what won't work, but what is cheaper?
Since the OP kinda mentions gaming, let the customers fiddle with their wine installs and steam decks and spend the time on adding more loot boxes instead?