This is what the author was addressing with "It’s worth noting that Flutter for Web is currently in beta and the problems I am about to detail could be addressed. However, I believe these issues are fundamental to Flutter’s design choices so I feel confident in my criticism."

I agree, this is a fundamental problem they are probably unable to fix.

For me it looked like that, too. I.e. flutter will never work friction less with the current web, at least for screen readers etc.

But I think what google will try to do in one or two years is to add extensions to the web to make flutter work well again (from their POV).

It was always my impression that rendering to a canvas was the quick n dirty way to get something running on the web, not the long term plan for flutter