True! I still think Linux is superior for people who want to configure their devices more, but I think a vast amount of people live their lives either online or in one of the services which on a Chromebook works well offline. That - and games & media - which I think tablets/phones/consoles are better at. I think Chromebooks seem to have reached a maturity point for "most people".
I have no doubt they have. I've used Chromebooks and they're great devices nowadays. Having Android apps available is great too.
But the title of this article is why the author left behind the Mac and the reasons for that are extremely shallow. Most of the time they don't even go into what makes it better than a Mac, that was mentioned maybe twice and honestly not for great reasons. A one time setup cost isn't exactly a great reason either.
The rest is just "look at this shiny that has more than enough oumpf for most users". Which is totally fine, new and shiny is awesome to write about and having a great experience with it that makes your realise you can change some aspect of how you work, improve your productivity and not pay Apple's hardware prices is great. But then just write that.
