WHICH IS OKAY, if we're talking about security/privacy, but performance ... not really.
It's not automatically OK to break functionality even for security/privacy reasons, IMHO. Browsers are used for many useful purposes that do not involve visiting sites run by large organisations with full-time development teams assigned to ongoing maintenance. Intranets. Embedded UIs in devices. Personal sites full of useful information but with no-one actively maintaining them.
The number of breaking changes browser developers have been willing to make in recent years does not bode well for the future of the Web, a platform which became what it is today precisely because it was a known target for developers and for a few years the industry standards actually meant something.
The Brave New Web is one dominated by ego-stroking contests between the major browser developers and huge, centralised sites with effectively unlimited resources run by just a handful of organisations. Notice that neither users nor original content creators appear in that previous description. The original author here is quite right to call the big players out for that. We saw Microsoft's infamous embrace-and-extend strategy and the way the Web was held back for years as a result. We should be just as wary when the likes of Google sing the same song.
And there are non evergreen browsers for those environments.
I agree that unilateral moves are bad for the web, but the reality was always that. Vendors have their own agendas, and usually the overlap is large enough.
Plus the change was always there too. Framesets work just as 'fine' today as they did back in '96, and the same goes for tables, divs, and falling snowflakes in the background DHTML snippets. The churn we see today is because the web became a lot more diverse, a lot of things were and are still live on the edge, some are in terms of performance and creative expression (just think about CSS Houdini, giving even lower level access gradually to the rendering pipeline), some in terms of security (because they depend on some implementation detail of browsers - such as CSRF protections, that took a decade to get sort of right with the Same Origin policy).
WHICH IS OKAY, if we're talking about security/privacy, but performance ... not really. Let the market (and the users) decide. If a site takes forever to load, and scrolling is impossible because it takes ages to scroll, and burns a mark in your palm in that time, then maybe you'll reconsider visiting that site ever again.