not that basic
its not that basic. in fact, your generalization doesnt even cover 2.4GHz B/G - which , in the
UK has 13 'channels' available for use (unlike eg US where they only have 11) - to have the best usage with minimal overlapping, you'd use channels 1, 7, 13 - but channels 12 and 13 arent readily available to many bits of kit without dealing with ETSI firmware - so, really, you're stuck to 1,6,11
in the 2.$GHz range. in the 5GHz range there are dozens of discrete channels that can be used - and with A/N you can even use 40MHz mode to get full N speed - something that isnt really suitable in the 2.4GHz because you cant have 2 40MHz APs without overlap in channel (they crash the channel 6/7 space).
I'm starting to get a little annoyed by casual wireless admins - it used to be that all my neighbours would happen to choose the channel I used...hats okay..I'd drop to 1 or go up to 11 - whichever had least duty cycles... but now I see neighbours on 3,5,8,9,10 - not a single chance of having noise/collision/interference free wifi :-(