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Many people do rely on it, they don't probably even know what a password does vs an open network.

If people around you tend to have a profile like HN users yes they of course know what they're dealing with.

Bur for the rest of the non-techie 99% of the world, public Wi-Fi is perfectly fine.

Perfectly fine for what? I live in Europe, everybody has Internet at home, and if they're out, they have 4G on their phone.

When would one need the coffee shop wifi, especially non-techies that go there just to have a coffee, not to work? Honest question.

The vast vast majority of Europeans don’t have unlimited data plans with unlimited tethering. Not sure why you would think they do.

Reception can be pretty spotty in many areas as well, so even if you do have unlimited data and tethering, you might benefit from a public wifi.