This sentence is interesting given that Safari is faster in virtually every single usage model. Safari is lighter on memory. Safari is far more efficient from a CPU cycle perspective (ergo battery life). Particularly notable, iOS web browsing is overrepresented on the web versus marketshare.
"Everyone" is using Chrome because it was the browser in the early 2000s that they used on their Windows box. Do you think Chrome has made a particularly compelling argument over the past five to ten years? It's the incumbent that has been coasting on inertia.
What "features" are people using Chrome for? What do you think iOS users are being deprived of?
Notifications from web apps? Yeah, no.
I have serious grievances with Apple's restrictions on their platforms, and some of these walls will fall at the hands of government demands, however iOS users are being deprived little by not having a full version of Chrome.