So it's no secret that A LOT first party studio that MS bought is using UE4 (with some using Unity and Slipspace) and that all these studios are doing tech sharing between them with pretty consistent meetups. By default we already see UE5 offers some insane quality and AAA studios will be making their own tools and systems (Sea of Thieves water, etc) so I believe having all these studios on Unreal Engine 5 and sharing their tech between eachother, we can really see a huge explosion in quality from MS's first party studios. Say the new Fable reboot just has a massively optimized open world system developed inhouse, well now that tech can be shared with any other studio and potentially be improved upon by the other teams and then said improved version could even make it's way back to Playground and help the tech keep on evolving for particular needs, I think scenarios like that aren't unlikely and make me pretty excited when this engine makes it's way into developers hands.