The first time it happened, I would get rid of whatever software was involved in causing it and never use it again, except for testing purposes.
I completely agree with you about everything else too. The Web is mature enough that I can use a well-tested website with a 20-year-old browser.
There is no technical reason to not have a minimum-viable web browser with a smaller attack surface that doesn't need upgrades for months or even years.
And, in fact, such browsers exist, and I can browse most of the Web that I need with them. I just have to ignore the shitty mainstream, which I am more than happy to do.