You really need an AP in every large room if you want Wi-Fi to not suck. That’s been the case for every Wi-Fi standard even on 2.4ghz. Increasing range just leads to more interference and latency spikes from hardware retransmit. Things have gotten better now that we have more spectrum, but https://en.m.wikipedia.org/wiki/Hidden_node_problem is still a problem since the vast majority of devices on the frequency belong to your neighbors.
This is the truth. Deploy for -52dbm everywhere and call it a day. Basically future proof.
Disagree, but maybe my house isn't as connected as others. Have a 2 node wifi 6 system in a 2200 sq ft home, and even then I wonder why I didn't go single node.
6ghz though will surely make your statement true.
Wi-fi 6 (802.11ax) can run on 2.4ghz, 5ghz or 6ghz. I wouldn't expect a difference in range for beacon frames between standards on the same frequencies, assuming they use the same power.