iOS Browser Engine Restrictions

Because Apple doesn't allow any other browser engines on iOS. iOS users are shackled to Webkit, and are unable to make a choice.

Chrome and Firefox on iOS are just skinned safari with their own sync and features. Apple does not allow third party browser engines and you absolutely have to use the one built into the system (webkit).

Firefox and chrome on iOS are just re-skins of safari. Apple doesn't allow other browser backends

Apple is the only ones holding anything back on iOS. They forbid any browser except Safari. At least if they let Google Chrome or any other browser maker use their own browser engine, iOS could have a capable browser installed. It is one reason among many Apple is being sued by the DOJ, but so far no progress forcing them to allow other browser engines like they did in the EU.

Browsers on iOS are just wrappers around safari. Apple doesn't allow 3rd party browser engines. So you will never see feature parity on iOS.

All browsers on iOS are essentially Safari with a different skin. Apple doesn't allow devs to use their own engine.

Apple blocks other browser engines on iOS, except in the EU.

Webkit is the only browser engine allowed on iOS. Chrome and Firefox use the same engine as Safari, so blame Safari and Apple. Apple doesn't want browsers to be as powerful as native apps on iOS.

Yes. You aren't allowed alternate browser engines on iOS. Every browser in the App Store is Safari wrapped in different skins.

At this moment Apple is effectively banning web browsers except their own safari. The other browsers you see on iOS are just a wrapper over the native webkit view.