That's true, but given that pinch to zoom is nearly ubiquitous, and given that the double tap gesture requires a 300ms lag before responding to single taps, the Web would arguably be better without it.

I can confirm that working around this issue is horrible. That dastardly 300ms makes quick operation of a mobile app a complete pain in the arse. Constantly having to wait for iOS to catch up with you. It really makes the experience horrible.

But that's how iOS want it. If they made webapps that performant then they'd have trouble imprisoning everyone in the App Store.