I like the spirit of this, but the problem is that it only works if everyone operates at least somewhat in line with it. If you're liberal in what you accept, t

I like the spirit of this, but the problem is that it only works if everyone operates at least somewhat in line with it. If you're liberal in what you accept, then people are going to start being liberal in what they send, and soon we'll have a proper mess on our hands. And there's no takebacks -- once you start permitting something, you can't take it away later, or you'll break things. You're creating more legacy requirements that may cause you problems when you try to evolve in the future. As a web developer, I can only dream of how clean web standards might be today if the browsers of yore were a bit more conservative.