I think similar how the EU adopted the USB-C as mandatory standard for charging, it should force other industries, including software vendors, to follow commonly defined standards.

In case of browsers that is Chrome using it's de facto monopoly to force other browser to rush to catch up with their custom crap. Yes, as a side effect that would also break a lot of existing webpages because they rely heavily on browser bending over backwards to accommodate sites serving effectively broken HTML i.e. but in the long term this would improve the internet as a whole.