What I’ve learned from nearly three years of enterprise Wi-Fi at home

[IdiotInCharge]

That explains it then, at least for the iOS issue. Splitting the SSIDs was a band-aid mitigation for that issue.

Are people still having to do this?

I have a work iPhone 7 that doesn't seem to mind having both bands on the same SSID...

Hell, it's the fastest client

[only one AP though]