We have just had the electrical rough-in installation done. Our setup on the TV wall consists of 2x triple sockets and a double LAN socket, nothing more.
In my opinion, that is completely sufficient for anyone who has a normal media consumption behavior aside from 3 consoles and a high-end hi-fi rack.
To list it out;
- TV or projector as a smart TV including DVB-S
- Telephone
- DSL router
- The rest for Alexa and co.
If consoles, Apple TV, Sky, and hi-fi are to be added, then 10 sockets make sense if you don’t want all devices plugged into a power strip.
But honestly, in the current apartment everything is connected to one triple socket + a power strip. You don’t die from that as long as you can hide it.