Using a wired network for things that can be wired frees up capacity for mobile phones, tablets, and laptops. For instance, if you are moving files to and from a server, you get way better performance if the server is wired than if the server is wireless too because the server->hub and hub->client links interfere with each other.

Mesh networks are just going from the frying pan to the fire.

I am not saying that people "don't need wireless" but that if having a reliable WiFi network matters to you, the best way to speed up your WiFi network is to move anything that you can possible move to wired to free up bandwidth for WiFi.

That includes turning off the rouge access points that are created by printers, game consoles, phones, etc.

Noone is saying that, but there's very limited bandwith available in the air (especially in the 2.4GHz band). If you move datahungry devices like TVs, NAS, etc. off the air, you gain a lot of free spectrum for the phones and tablets.

Exactly, the gains from proper engineering are vastly greater than from buying expensive consumer routers, particularly when you consider reliability.