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A mesh system includes the router.... everything involved in the mesh network would be wifi 6...I'm striclty talking less range with wifi 6, not backwards compatibility, which is my other point. Why not just upgrade when more devices are compatible with it? If we are talking economics and saving money, which we are that makes more sense. And how is having one device, I.e., the router only wifi 6 capable and none of the AP mesh units useful, unless it's literally in your main coverage room/area? Back to my main point homes that are OK range wise with one router or even one additional ap unit may require 2 or 3 more ap's for the same coverage when desiring wifi 6 speeds and don't want to fall back to older AC or N. The average home owner is not going to understand that and or be overwhelmed when dealing with a mesh system.
But if you have even one device with wifi 6 (like a cell phone or laptop for example), it would be beneficial - even if the rest of your devices are wifi 5 or less.
Again, a wifi 6 mesh system is pretty cheap and easy to install...