We’ve retrofitted a cat5e “network” into our place. It looks a bit scrappy as it’s external. But we now have 100% uptime on all the hardwired devices (server, NAS, couple of Desktops, Playstation) and three well spaced, wired wifi access points using the same ID/password.
So all the wireless devices (phones, tablets, laptops, Wii, pi, chromecast) have almost 100% uptime as well, with very good speed as well. (Wife’s phone is the only thing that has noticeable issues, nothing else drops signal for more than a fraction of a second).
We can stream anything anywhere in the house. Full HD and surround sound.
If the place ever needs rewiring i will have no hesitation in paying the extra to have a 5e (or 6) network put in.