Not to mention if you were going to do it based on standards support and caniuse.com statistics, it's Safari now that is the one that lags behind. Shouldn't Google also start blocking Safari now? Isn't that closer to "fair play"?
2) This isn't a "We won't support you, use at your own risk" banner, this is a Chrome ad. It's a Chrome ad disguised as a support banner. It's a Chrome ad that is designed to get ignorant users to install Chrome out of some fear. This is no better than those "Your computer is unprotected, install this fake anti-virus to fix your computer" malware ads you see everywhere! Sure, maybe Chrome isn't malware to you, but it's unneeded confusion to, say, my grandmother, to have her browser suddenly change because she installed a thing Google told she had to to stay "supported"...
3) This is a case of "Proprietary" versus "Proprietary" on Windows: Chromium is open, Chrome is not and especially on Windows has adware and custom extensions that are fairly opaque and proprietary. On the other side of the fence: Edge's JS engine (Chakra) is open source and community developed, and Edge's WebGL renderer just became open source. Edge is already more open and standards compliant than IE ever was. Blaming Edge for IE's old problems is like kicking your new puppy for things your recently deceased dog did.
4) Yes, as a web developer, I remember bad experiences with IE's implementations of standards, but unlike some I also remember some of the good experiences. I also am aware enough as a web developer to know that IE's "bad" implementations helped make the standards better. Plenty of people can talk about how IE contributed XHR and AJAX. Another example is that "box-sizing: border-box" you see littered throughout CSS these days is "Hey, use the modern version of the classic IE way because it is easier to math." The point of the "Open Web" is not that "mistakes shouldn't happen and standards should be implemented in lockstep", it's that anyone can and should implement the standards and when the implementations don't agree we use that to make the standards better! Chrome owes a legacy to IE, and "bad experiences in the past" don't outweigh the benefit to the Open Web today by not interfering with users that choose to use Edge regardless of whether or not that's simply because it is Windows' default browser.
It is?
http://caniuse.com/#compare=edge+14,firefox+50,chrome+54,saf...
Skimming it, Safari seems to do a bit better than Edge if you just count boxes; at any rate it's not significantly worse.
That said, it was also a dumb joke. :) I do not recommend adding banners saying "This site is not supported on iOS Safari". Imagine how many users you would anger doing that.
Edit: And this post downvoted within seconds. What a fucking joke this place is thanks to assholes abusing their karma. (If I'm going to be downvoted, it may as well be for something real.)
I can get dropping Edge if you are an individual developer and simply don't have any Windows machines around (testing websites from a VM really sucks), but going Chrome-only pushes us back to the monopoly position that harmed our field so much in the first place.
Actively moving towards a webkit-monoculture ultimately harms our profession.