>At this point I’m not sure there’s a need for normal users to actually turn off Wi-Fi. The only real case would be something like airplane mode which already has its own setting.

I ran into a use case for turning off wifi the other day. My ISP was having problems and the wifi network could not reach the internet. Turning off wifi saved me the trouble of forgetting my wifi network, and then looking up / typing in the password when I rejoined.