Hey, Bartimus.
I've never come across a device that's actually incompatible in this way. All the examples I've seen myself or where it's been mentioned by others are actually just manufacturer oversights. They detect the phone connected to the 5ghz band during set up, and then tell the user they can't set up the device because it's compatible with 2.4ghz only, even though the network has a 2.4ghz band as well.
Most manufacturers fixed those limitations within their setup processes so that the apps just give you a warning or reminder, then they continue on to complete the set up. There's a couple of different ways to work round the ones that still have issues. You can alter the settings in the Hub to disable the 5ghz band temporarily, then set up your devices, or you can set the phone to not use the 5ghz band if the phone allows you to do that. Once your devices are set up, you can put things back to normal.
Another possible way to avoid the issue, but it's one I wouldn't really recommend for most people, would be to change the SSID name of the 2.4ghz to something different than the 5ghz one, and this would stop setup issues like this from happening in future, however it also means your devices won't roam between the bands as smoothly as they used to. For example, if you went to an area of your house where the 5ghz didn't reach you, your phone/device would switch to the 2.4ghz network which has the other SSID. Once it does that, it would not switch back to the 5ghz network again unless you went into the settings manually and changed it every time. The same would happen for any other devices that move around. Quite frustrating.
Pete.
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