Thinking out loud: what about a transpiler project that goes from backwards-compatible current standards to stricter but more implementable standards. The idea

Thinking out loud: what about a transpiler project that goes from backwards-compatible current standards to stricter but more implementable standards. The idea is that you run everything you receive through this before your browser starts parsing it, so that you can support a larger part of the web while implementing a much smaller set of standards. Like Babel in reverse. Of course, there's still a monoculture in transpilers, but at least there could be more browser competition after that point.