I like the author's writing style too... This seems to be as much an exploration as anything:
>I’ll be the first to admit it’s not perfect yet – some vertical alignment is wrong in a few places, Hangouts doesn’t work, and our ‘contenteditable’ support is minimal. But I don’t think these detract from the achievement – as far as I’m aware, no browser engine other than Webkit, Blink and Gecko can run full Google Mail, and these have all had over twenty years of development work on them.
>I’ll be the first to admit it’s not perfect yet – some vertical alignment is wrong in a few places, Hangouts doesn’t work, and our ‘contenteditable’ support is minimal. But I don’t think these detract from the achievement – as far as I’m aware, no browser engine other than Webkit, Blink and Gecko can run full Google Mail, and these have all had over twenty years of development work on them.