If you separate your 5Ghz and 2.4Ghz and only connect to your iPhone to the 5Ghz network then your Apple Watch will never connect to your WiFi. This why people in the know blend the network and use band steering to move the devices to the best available network. Also, most people can't disable 2.4Ghz because a lot of home automation gear will only connect to the 2.4 band.
Band Steering was not a set standard and is certainly not common in most residential routers. It actually becomes quite problematic when it's used but the router does not have it implemented properly, case in point this issue some are having.
The average person who buys the cheapest wifi to mid-ranger router is not going to have proper band-steering. You need a >$300 router for this.
I've seen this stuff over 2.5 decades now. Some idiot buys a Maserati and then complains when they cannot drive 180Km/h down an unmarked dilapidated road.
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