You can completely disable it in Settings if you 'wanna'.
Personally, I like the quick access in Control Center to a temporary disable option. I have accidentally (idiotically?) left Wi-Fi turned off, because of a limited Wi-Fi network blocking internet access, and then had my cellular data run over the limit when updating apps the next day at home because I forgot to redo the setting.
I completely agree. IMO that's exactly why they did it. I need to temporarily turn off WIFI very frequently. Before ios11, I would almost always forget to turn it back on when I got home, and it really bugged me. I think the new behavior is brilliant.
I think people miss that purpose, and I believe people overestimate the amount of battery life consumed by leaving it on. Sending or receiving large amounts data through wifi or cellular consumes a lot of battery life, but the simple periodic check for available networks (when wifi is on but idle) is a pretty minimal hit on battery life.
BTW I wonder if anyone has considered the fact that this wifi/bluetooth control panel behavior has precedence (and consistency) with the Do Not Disturb control panel behavior, which has ALWAYS been a temporary toggle.
I do believe that a hard press option to choose either behavior, (or a settings preference for "Control Panel turns off wifi completely") would make a lot of people happy, though I personally wouldn't use it.
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