Unfortunately, from my bathroom, I can see around 60 devices announcing they are APs on the 2.4GHz band, and every single channel except 12 has something centred on it. Which essentially means that 2.4GHz wifi is not really working for anyone unless they are on top of their routers.
Now, if the eedjits reconfigure to be just on the non overlappers - ie, 1 and 6 only (11/13 needs far too much cooperation), it would work well for everyone.
I notice Sky routers are a bad offender (unlikely to be routers fault, probably Sky Support are shite), followed closely by 2 HP Envy printers (Envy = expensive+unreliable
).
On 5GHz I can't see any overlappers 
Everyone around here has their 5G on the same channel. I guess that the bloke down the pub has only misinformed them about 2.4Ghz

5.8GHz here has very limited range (its never the best) a lot of the time, depending which way the nearby yanks have their antennas pointing.
This is my issue, as I tend to use 5.8GHz, because it works best, but occasionally its range won't get through 1-2 walls - probably due to the yanks - so the devices fall back to 2.4Ghz, which is guaranteed to lose my posts.
"RAF" Croughton* is the reason that 2.4GHz is essential around here. If only people would set them up responsibly.
* USAF base. Famous for the Yankee bird knocking that kid off his bike by driving on the wrong side of the road.