Other Browsers Will Always Be Inferior to Safari on iPhone & iPad?
In 2014, Chris Hoffman (the How-To Geek) wrote a post called "Why Third-Party Browsers Will Always Be Inferior to Safari on iPhone and iPad." The reason for this, he explained, is that Apple’s App Store policy states that apps that browse the web must use the iOS WebKit framework and WebKit Javascript. That means third party browsers on iOS can't use their own rendering engine, instead they have to use Safari's rendering engine, so third party browsers are little more than different interfaces for Safari.
He went on to say that third party browsers have to use an older JavaScript engine while Apple’s newer JavaScript engine is reserved for Safari alone. That means that Safari will always render faster than third party browsers on iPhone and iPad, if I understand this whole thing correctly.
Is this really true, and is it still true in 2015?