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The issue with beating chrome isn't feature parity, but overcoming the massive lock-in.

Not super active with Chrome, so what lock-ins are you referring to? Like password management and extensions?

Maybe the lock-in caused by Google (and others) making Chrome-only websites. But AFAIK its not brazen enough to exclude other Blink browsers.

What websites are Chrome only?

Not sure about current status but sometime back WhatsApp Web was Chrome-only.

Chrome often implements new browser features before other browsers. So, webapps are made with new features that aren't available in Safari, etc