Not sure if this is actually a desirable feature or just another annoyance like <blink> or <bgsound src="rickroll.wav" loop="infinite">.
The new blink is coming on your devices.
This is such an useless and annoying feature.
Nonsense. If you want to make an app that offers the same functionality of a native app, then vibrate could absolutely be useful. Not to mention a compelling video game experience (what console hasn't used vibration in the last 10 years?)
Less and less needed from wrapper Apps these days.
Still very useful you want the marketing power of an app store or want to use in app purchase.