When Microsoft was in a monopoly position, they ignored the standards and pushed ActiveX plugins. Chrome this year wanted to push other browsers to adopt obsolete U2F specifications because they used them in Google products. If there's a single implementation, and the gatekeepers are majority from one company, standards and interoperability become irrelevant.
That's a good thing. What's the point of maintaining four separate software projects who's ideal purpose is to literally do the exact same thing. It's much better to settle on one open source project. If we think Google is the boogeyman then settling on a Chromium fork is still light years better than what we have now.
The common ground is the standard not the browser implementation. The web has been working well and is still working well with multiple implementations.