It is far less work to dedupe WET and abstract later once you truly understand the correct abstraction than it is to try to untangle the wrong abstraction later.

Or as Sandi Metz would say, "Duplication is far cheaper than the wrong abstraction."

Letting go of the Old Way is just as valuable without having a preferred replacement.

It's similar to the bell curve meme about any niche/skill. A beginner only focuses on the fundamentals, a "mid-level" focuses on all the best tools & methodologies (to the point of overcomplicating things), and the master only focuses on the fundamentals.

I think maybe what you mean is it doesn't give you any guidance on when to do that, other than "sometimes".

That's just a matter of taste and experience. It depends on the specific code and circumstances.