Comment by kiitos

> if an interface has enough consumers, they will collectively depend on every aspect of the implementation ...

Yep!

> [and that] constrains changes to the implementation, which must now conform to both the explicitly documented interface, as well as the implicit interface captured by usage

Nope!

Software authors define the rules for the software that they author. I understand it's a spectrum and the rules are different in different circumstances but at the end of the day my API is what I say it is and if you rely on something that I don't guarantee that's on you and not me. Hyrum's Law describes a common pathology, it doesn't define an expected rule or requirement.