And remember “we” is often you, the maintainers of the packages you rely on, the maintainers of the packages that they rely on, the maintainers of the packages

And remember “we” is often you, the maintainers of the packages you rely on, the maintainers of the packages that they rely on, the maintainers of the packages that THEY rely on… All need to have lock-step agreement about what a “breaking” change is, and all need to have communicated it clearly. The result though is the same, semantic versioning or no: If something changed you must retest. This is why all that’s needed is a “do I need to retest?” flag. Major/minor/patch is irrelevant if you need to keep things working.