[lathiat]

Disconnecting from the current network is usually because something is broken about that network for some reason (or in some cases, 4G is just much faster). Having said that, the number of times I do this has been significantly reduced by "Wi-Fi Assist" (which turns off the wifi network automatically if the connection seems poor/broken). People also complained about this feature (because it uses my mobile data!!!) -- but I imagine the majority of people are now blissfully unaware when their iPhone saves them from apps or pages not loading and the general experience is much better.

Having had this discussion a few times, I'd love to do a solid battery life investigation of turning off wi-fi properly versus this toggle.. given it disables auto-join I imagine the scanning frequency is significantly reduced and thus the power usage is probably relatively comparable (close enough). But that's just a guess, I don't know for sure, but I'd sure love to know.

I'd also love to know the battery impact of turning bluetooth off entirely. These things all seem like antipatterns to do as a regular usage thing and I think that, in most cases without actual research, they're a bad idea for people to get into the habbit of. For precisely the reasons outlined here and by apple.. later using mobile data accidentally, being confused your apple pencil works, etc.