I firmly believe the theory that they just straight up lost the source code and that's why we don't have even a PS5 port.

These days, probably not so much, but there was a time where console exclusives were a pretty big selling point. Halo CE sold a ton of Xboxes.

As someone over the age of 30: this was the only real reason I used to buy a console anyway. If you've bought a console for any reason other than that, I'm sorry to say you likely overpaid for a media streaming box or underpaid for a general gaming rig. I still go by this rule, only buying consoles to get at exclusives, but the current generation is relatively easily emulatable, has timed exclusivity, or in xbox's case, has basically no exclusivity. I can see arguments for the series xbox being a cheap and effective way to game these days if you only have a work laptop, but the game library has always been the selling point of a console for me.