Isn't that what all large projects are doing internally? Hell, big chunks of the git chrome (things like "git am", "git request-pull", "git send-email") is
precisely an attempt to write scripts to automate core parts of the kernel workflow. Github added bits of its own, like "watching" a public repository and providing a core spot for pull requests to land, with discussion and review tools. I don't understand why you're so interested in "enforcement" when projects using these tools seem to be doing just fine.
What you're saying sounds to me a lot like the stuff we heard from Java nerds in the 90's (who certainly didn't invent it, Pascal and PL/1 nuts said much of the same stuff) -- the programming environment should be designed to force the user into a particular style. Our community has, for the most part, rejected that view in favor of dynamic systems with more flexibility. Why should SCM branch management be any different?