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Well, there is a hardware key, it's just that it's the device you're using.

In other words, having a hardware key is not a real barrier to use.

The opposite. It's a barrier because most users don't have one.

…and yet most users are browsing using a device which itself contains a hardware key… and thus it is not a barrier.

What if I don't like viewing web pages on a phone?

Right, but that gets rid of the objection: there’s no second thing to buy and carry around, it’s faster, and it’s more secure than the alternatives.