Cool tech but I don't get it. Who cares for ghostly 3D re-creation of moments? It demands so much more than snapping a 2D photo for a result that can be qualified "strange" at best.
I find XR much more interesting for things that are otherwise impossible, say traveling through the solar system or the human body, playing a rhythm game while punching things in the air, etc.
This is totally overblown. They are not "worlds", it's usually 10x10m spaces at most, nor photorealistic, so much is left out, there is not animation, no physics, etc.
PS: FWIW I tried some splats in XR, and I also did some photogrametry few years ago. Again it's an interesting process but it demands a lot for a result that few non-tech people would genuinely be impressed with to the point of replacing their holidays photos with.