Following this excellent post, doesn't it mean that if all your neighbours are using 5GHz band, your wifi network will face interference just like the case with 2.4GHz?
For 2.4GHz band, 1,6 and 11 are the recommended channels and are safe to use. Isn't this applied to 5GHz also?
According to physics, high frequency waves overlap each other lesser than low frequency and therefore produce less noise. But waves with similar frequency produce interference independent of their magnitude. It means that even 5GHz band will suffer just like 2.4GHz does.
Another noticeable thing is, in networking we use band and not a particular frequency but even in the case of band your waves is going to be collapsed with your neighbour.
Today, people use dual band wifi routers so in this case overlapping will be much higher than individual bands. Do channels 1, 6 and 11 work in this case?