Comment by paulddraper

The principal is correct: "the bigger the interface, the weaker the abstraction."

But perhaps you feel there is an second implicit, prescription: "Your abstractions should be strong."

And that's not necessarily true. To every thing there is a season. Excessive abstraction is astronaut architecture.

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The principal is a good one.

The bigger the interface, the weaker the abstraction.

That's not to say big interfaces are bad or inappropriate. It's just to say they aren't strong abstractions, so don't expect them to be.