But your home NAS should be on ethernet? Who would buy a NAS and then not wire it in??
The point here is that only devices like a TV, mobile, tablet or laptop should be on WiFi and it's pretty hard to notice the difference between say 50Mbps and 500Mbps on any of those except maybe if you are moving files around on your laptop.
Family of 4 comes home after a long day out, all plug in their phones at the same time to charge and drop down in the sofa to vegetate in front of Netflix. Why is it buffering so bad?!?
Traffic is bursty. Higher bandwidth connections make the whole internet more efficient - if you can race to idle then servers have fewer concurrent connections to keep track of, routers can more quickly clean up their NAT tables etc etc
The point here is that only devices like a TV, mobile, tablet or laptop should be on WiFi and it's pretty hard to notice the difference between say 50Mbps and 500Mbps on any of those except maybe if you are moving files around on your laptop.