Uh, who cares... no one is even using 5.6 yet for that matter cuz for most UE5 games development started long before any major updates and no one is updating all the work they've done over the years to work with newer UE5 versions.
Like, imagine having to replace all the foliage in your game and use Nanite instead. Not gonna happen, ever. All these major Engine updates will matter for newer games only.