NRSROSE: The Not-Rocket-Science Rule Of Software Engineering is the rule that a line of code, typically a branch in Git, is automatically guaranteed to always pass the entire test suite. Bors-NG implements those rules, but so do:
The use of GitHub Protected Branches with the “Require branches to be up to date before merging” option implements the NRSROSE. (Of course, as explained here, this is much less efficient than Bors, and requires more manual activity by maintainers, but it does guarantee a Git master branch that is “automatically guaranteed to always pass the entire test suite”.