We have a Hub 3 in Router mode + 2 WiFi Access Points to cover a large 4 bed house.
Before the Access Points were added we often saw WiFi devices being their own worst enemy and connecting to the Hub at 5GHz when the distance / number of solid walls was too much for a reliable connection. In these situations the use of the greater coverage from the 2.4Ghz band often provided a more robust signal that was plenty fast enough for a TV to stream a film or for a mobile device to operate on.