Hi Gabriel,
My approach is that if you have a fixed position ethernet tcp/ip device in the home and there is an option for hard wiring then i prefer to install a cable.
There are clear advantages like keeping the wireless bandwidth for your mobile devices, speed of comms and also no need to worry about firewall configuration e.g. ports for certain functions.
If I was to implement 4 systems in ceilings I would not compromise and hard wire the devices. It’s difficult to quantify cost effort benefits but from experience the time you spend with hard wiring the devices will be saved on problems in the future.
For example some wireless webcams now have function to reboot every x hours to avoid losing footage through wireless disconnection. Doesn’t make sense to me. There is no technical reason why a tcp/ip connection cannot be maintained for a very long period. Hard wiring also helps improve this. Can’t beat a physical cable IMHO (where possible)
Hope this helps, Kevin