Even MS Edge is on a rolling release with IE11 just sitting back there in its corporate shit role. Safari is really the last big browser not to move to rolling releases.
Microsoft had no desire to improve IE and make the web a more desirable platform than Windows. (I'd suggest it still doesn't)
Google, however, directly benefit from the web being a better place, and they know first hand that a dominant browser can be toppled. And the competition is fierce, with MS back to bundling and it's so easy to switch browsers now that there's (currently) a good compliance of standards and no such things as ActiveX.
Microsoft was given an ultimatum by the US Department of Justice to stop improving IE, because at the time people thought browsers and the web shouldn't be a part of an OS base install.
Microsoft started what Electron/Cordova/PWAs are continuing today, where the web is a first class application platform in nearly every OS, and nearly every OS needs to bundle a web browser as core functionality.
> Google, however, directly benefit from the web being a better place
…to serve ads. As long as the web remains the most universal platform for ad serving, Google's interests follow.
> now that there's (currently) a good compliance of standards and no such things as ActiveX
Let's not forget how recently Google tried to make NaCL, its own play at an ActiveX-like thing.
It's only recently we've "killed" Flash, and Oracle and others are still holding a lot of Enterprises hostage to Java applets.
Mozilla may be the only group without sin here, and they live in a glass house, to mix metaphors.
The need for greater variety in the spread of popular rendering engines is dire and real. Browser monoculture is dangerous and I refuse to use any browser that’s Chromium/Blink as my daily driver for this reason. I seek alternatives for sites that obviously haven’t been tested in anything else - if you can’t be bothered to properly service Gecko and/or WebKit you don’t need my traffic.