It would be amazing if they could also take user-generated photos and videos at ground level and accurate mapping data (that has building outlines) and clean that up to something presentable.

I mean, what they do here is what google and apple are already doing for years. It's time for the next step.

I suspect hybrid solutions will remove the limitations of GS, with (eventually...) some smooth hand off. Do clean-enough GS like this; then hand the output to other systems which covert into forms more useful for your application and which adopt e.g. textures from localized photos etc.

It's just a bit of engineering and compute...