That kind of exists, but it's still giving Google power because it relies on their software. It basically makes it really difficult for anyone to shape how the web works besides Google, since no one has any browser market share.

For example, WebAssembly started out as a Mozilla project. What if Mozilla didn't exist, or Firefox didn't have any market share? It would never have been created. Think of all the accumulated features/innovations that could exist over the next few years that might not if the only browser engine being used is controlled by a single company.