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The real issue is how limited our so called "unlimited" data is. Right now I pay over a hundred a month for only 2GB of LTE data. If you like watching videos on the go this data is gone in a flash! But this might be at an end. Thanks to how much data 5G can burn through carriers in countries developing 5G networks have had to update their data packages. Right now for the same price in China I would have gotten 40GB of data more than enough for a month's use even if I was crazy and wanted to download HD videos like they've been marketing as one of 5G's abilities.
My advice about public wifi is just not to use them at all. Even if you follow all these steps (minus the bring your own of course) it doesn't guarantee that someone else with access to the network can't easily use the connection as an exploit to hack you.