Single-family house 130-140 m² floor plan planning

So I haven't used LAN for 15 years and therefore I won't install it.

If you are convinced you don't need or want it, fine by me, but the logic chain is a bit off with such a topic. (I mean drawing conclusions about the future from the past).

What should I need it for?
Mobile phone, PC and TV are connected to the WLAN.

Does it still work if 3 devices are streaming movies, 3 people are online at the same time, and nr 4 is uploading a photo book?

Wi-Fi is not unlimited: multiple devices simultaneously, eventually it hardly works anymore. Everything runs in slow motion.

How do you connect your WLAN access points? Do you really want to install repeaters? But OK, it’s not my house and I don’t have to live in it!

At the moment I know some people who are a bit annoyed because much less goes through WLAN than what arrives at the router. For me, stationary devices and access points belong in the LAN and only the mobile ones in the WLAN.

Hmm then we'll run 3 more cables to the children's rooms and the living room TV. That won't cost much.