Exactly that. Just because you want new behavior doesn't mean all the other consumers of that class also want it. The old behavior should still exist, and have

Exactly that. Just because you want new behavior doesn't mean all the other consumers of that class also want it. The old behavior should still exist, and have a name. I'm not sure whether the idea was ever fully developed into patterns for replacing deep hierarchies with simplified classes that factor out some inheritance from otherwise-unused base classes.