I think I've done only one house where the owner wanted to be able to put speakers in every corner of every room on every floor with multiple possible locations for his stereo.
Then he wanted multiple cable tv connections per room, multiple sockets for landlines, Ethernet everywhere.
The speaker tube was left empty and a few short distance sockets didn't have wires in them.
It seemed excessive even to me but it isn't actually a lot of work to run 5 tubes in stead of 1. You might add 1-2% to the renovation bill. Even less for a new house.
The end result was wonderful. He could do his chores with music all over the house. Move his TV sofa bed or desk where ever he wanted.
Doing this after the house is finished is more expensive, it takes a lot more work and the result is inferior.
I think nowadays we should have an USB socket next to each power outlet that provides both internet and extra fast charging. In reality I've never even seen such socket.
With a few small updates Android could switch off wifi and mobile networking and seamlessly switch to calling over <s>wifi</s> wired internet when you plug in the charging cable.
Who knows, maybe the mobile phone could even be a first class citizen in the landline network.