[addicted]

For me the more common case for switching off Wifi is that I'm gonna connect to a network that is slower than the cellular network.

And no, I'm not turning on the Apple "feature" where it drains out my cellular data limits even when I am connected to excellent Wifi at home.

[epmaybe]

I was under the impression that the feature you are referring to wouldn't take cellular data unless you were not getting a good signal from the WiFi connection, or if you are moving fast enough to be dropped off the network.