This question is about scenarios where many other independent routers are nearby, like in apartment buildings etc.
There are many articles online (like this one on lifewire) showing how to manually find a channel / frequency for routers to use, and getting a list of networks with channel numbers is simple (
iwlist *interface* scan | grep \(Channel).
However, does it make sense to choose the channel manually if most other routers are set to choose automatically?
Or will it make things worse after a short while, when other routers change channels?