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And Apple is forcing all other browsers to use its JS engine on iOS - so when Safara/its JS engine falls, they all fall.

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Half untrue -- Apple allows you to use third-party JS engines on iOS. I've seen SpiderMonkey and Jurrasic (C#) used on iOS.

What they don't allow third parties to do is JIT compile. The "execute writeable pages" entitlement is only allowed to Safari and in iOS 8 WKWebViews.

So your bigger point stands -- third party browsers all need to use a single JS implementation if they want to have the speed of a JIT.

I think I prefer a single trusted implementation by Apple to N implementations by whoever wants to give it a shot.

With that logic applied to Windows, V8 would never have seen the light of day.

But that misses the other side of the argument, a fix for them is a fix for everyone and improvements to core are free improvements for everyone.

Which also emphasizes the point that Apple wouldn't ship this sort of code on iOS if it wasn't properly secured.

By that logic we should all be happy that Flash isn't a spec implemented in 4 different browsers, but rather on monolithic monster from one company, in all of them.

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