Like the last guy said, all about penetration. Higher frequencies just plain interact with stuff more, it’s why you only hear the bass from outside a concert and why people were worried about 5g giving em cancer. My 5ghz stuff goes to shit when it rains while the 2.4ghz doesn’t even notice. If you’re rural and connecting stuff between buildings/through vegetation 2.4 is still where it’s at, if everyone in apartment buildings switched to 6 they’re interfere with each others stuff less and all have better signal