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Let me guess you don’t live in an apartment?

5ghz is important if you are interference limited. The lack of wall penetration and short range become benefits.

2.4ghz provides very poor performance in my condo due to the 30 different SSIDs I can see from my lounge room.

The 30 SSIDs your device can see are bad, but what might be even worse are the many non-802.11 devices on 2.4 GHz that are invisible to a simple SSID scanner and don't share bandwidth fairly with 802.11 CSMA/CA. (This includes Bluetooth!)

5 GHz has much less of that, but big parts of it have weather radars as a primary user, with APs being required to detect and avoid any channel where they can detect one.

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