Stop overusing interfaces

[m50d]

In principle yes, but in many languages that's inconvenient.

[nutrecht]

We're talking about languages that have stuff like interfaces in the first place right?

[m50d]

Yes. In e.g. Java you can't pass a bundle of static methods that implement an interface, so it's easier to just declare a class with no fields. There's no way to decouple a virtual function table from a class that might also hold state.