I agree with this and the fact that 6GHz should still be available for wifi, but this whole bandwidth frenzy over wifi has always seemed like a meme for anyone except power users. A 4K netflix stream caps out around 15mbps, so >95% of typical home users will be just fine using 2.4/5GHz inside their own homes.
In practice it is all about degraded performance. If you're sitting in another room than the AP, close to your neighbour, do you want to be left with 50Mbps remaining out of the original 5000Mbps, or 2Mbps remaining out of the original 200Mpbs?
Yeah, but that's just because Netflix streams are ridiculiously over compressed -- they use extremely low quality encodes. It's technically a "4K" stream, sure, but at a bitrate only realistically capable of 1080p.
An actual 4K stream (one capable of expected resolution at 4K) is around 30 to 40mbps.
I mean sure, its usable, but its not good. You can notice the differences in buffering / scrubbing speed well into the 100+ mbps range.
Plus being able to download and upload files quickly. Particularly from something like a home NAS, is important. 15 mbps is like using a shitty USB 2 stick for everything!
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.
Your smartphone is not talking to your NAS over Ethernet.
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