Using all 5 Ghz channels available in your regulatory domain is not a choice, it’s a matter of fact. Here’s my experience.
I did a validation survey at one of our remote sites. The survey data showed severe co-channel interference almost everywhere. The site lies in open countryside and has no detectable neighboring APs: all of the APs are our own and they all transmit in the same 4 non-DFS channels as shown in the reading taken at location A on site:
