There's a lot of features that Chrome on Android supports but that can't be added to Chrome on iOS because of Apple's policies. Important features, like fully offline-capable webapps.
I can see your point, but every platform has its own restrictions. Desktop Chrome can do a lot that Android Chrome can't. There are real security benefits to not allowing downloaded code to run on a device without passing through Apple's JavaScript engine. Of course security and features are often at odds. Outside of tech forums, I've never heard anyone complain about missing features in iOS Chrome, so I'm just saying that to most people, the interface, bookmark sync, etc. is what makes it Chrome, not the JavaScript engine, and the tech it's built on will continue to change over time, bringing new features and new restrictions.