Everything paved in marble would not be quiet. Sounds would reverberate for days ~shutters

I've toyed with the idea that a established solar punk world would build down into the earth, rather than up into the sky. Humans can't occupy 100% of the Earth and there will be a need to not only protect but create a thriving environment for the other creatures we share this planet with, most of which live above ground.

Even if the above scenario doesn't happen, technology will keep evolving either way. Plenty of things to do inside buildings with enhanced AR/VR functionality. Lots of ideas there!