Tim Lamb wrote:

A gentleman from America was explaining how he had run 4 cables to each
place he was likely to have a TV.

This could easily be 4 sites here plus the PC in the office. Do I really
need 18 separate cables?

Probably not, it sometimes handy to run two cables to a location so you
could connect e.g. a smart TV and a set top box, but for anywhere with
more devices than that, a small switch is easy enough to "split" the
ethernet any number of ways.