Back in 99 my mom was building a new townhouse. I had them run cat-5 everywhere. I also had them run a 3" stack down the utility wall.

The builder, who had done commercial, really hated the requirement. They were supposed to let me vet the cable before closing up the walls. They closed up half of them. The effing electrician stapled through half the exposed stuff. Somehow that was acceptable with phone wire and power... that's what he tried to explain. Guy also left maybe 2" of cable in the wall boxes, he had terminated it all as phone jacks, so just cut it back. Luckily the GC asked me what the stack was for before they put it in, they almost put joints in it in the wrong spots.

We ended up getting comped for the whole install and they fired the electrician (several other fuckups). Luckily the router -> gaming pc run survived.

I'm assuming builders know what they're doing with network cable these days. I'm glad I didn't have the electrician try and run fiber (that's what the stack was for).