I rent an apartment in a building that was erected around 2015. They laid an ethernet connection... with a 100Mbps bandwidth limit.
Some people just don't care.
Some people just don't care.
I'm busy retrofitting Ethernet in my house by pulling cat6 through the walls and pulling out the old cat3 phone cabling. It's much harder work doing two cables (not least because none of the phone cables were in conduit, so it just starts off harder already) for each pair of ports, but it's very much worth the effort.
They didn't care, they just laid some sort of cable because that's all they had to.
there are a variety of ways to screw that up. i've seen a house that has a bunch of cat 5e run, but the installer stapled it down, and most of the cables have a staple through them somewhere along the run, killing a pair or two.
Cat6a is probably the sweet spot for home/office/etc structural cabling. It's not much more expensive than Cat6 (or Cat5e in case people are still putting that up), and has more than enough legroom.
If each run is <55m then Cat6 can still do 10Gbps.