Some houses we "grew" up with had phone sockets in every room, the modern equivalent would be an Ethernet socket.

And we should also work towards making that a standard, too (i.e. like wall sockets are standard for power, Ethernet sockets should be for data). I'd agree with the notion that "smart" (I'd prefer to say home automation) devices are the way to go, but highly disagree with everyone "Oh just key-in your Wi-Fi password, and good to go!".

Air is a shared medium with inherent collision problems. Avoid it at costs that slightly exceed convenience.

EDIT: Also, home automation. In most people's lives, one's "home" is one of the most static things in life. If anything, your home would be worth spending an additional thought or two on proper planning, to avoid headaches that'll haunt you later.

I've run drops to any place where I have a static device (a couple desktops, several Chromecasts, etc).

I know just about everyone in my circle, in tech, filled the walls with smurf tube when finishing basements and any other wall they could get away with.

Pretty much every house built in the last 25 years does at least.

Not in the houses I've been looking at. Out of dozens I looked sty built within the last 10 years, only 1-2 had it. And the current owners weren't using it.

AFAICT, They're built with the presumption of wifi.

That's weird. It's not expensive to wire houses, and you can't get gigabit fibre speeds with ethernet. You certainly couldn't get anywhere near it 5-10 years ago, but gigabit fibre was available then.

Not true in my mid-sized city in the Pacific Northwest.