The X is a much better place to launch a generations less base from. It is powerful enough to have been able to have much more PC functionality. Meaning it could have suddenly gained PC exclusives of some of the biggest out there like Lol, Wow and others. This would have made it much more desirable to the wide world in general. They could have also try delving into VR, AR and other emergent tech.
4k-ish 30/60, would have meant that a more powerful version alongside PS5 could have made the full transition into something with a lot more oomph for a real generationless device. If Xboxes sales are going to continue to drop by such a significant amount, they have nothing to lose.Looks like MS are going to add a game streaming service anyway at E3, so I wouldn't be surprised if they cut the slim out of some exclusives at that point, and made some games run digital only, to avoid having the slim acting as a ball and chain.
Either way knowing when to cut your losses and go full new has worked wonders for the slim, albeit has some beautiful exclusives to boost launch. Whoops meant to quote zorg, but never mind. Just my thoughts anyway.