you skipoed parts of my comment: you can have those bnefits, by backcompatibility, which you do by evolving only by adding, not changing the part of the interfa

you skipoed parts of my comment: you can have those bnefits, by backcompatibility, which you do by evolving only by adding, not changing the part of the interface that is already there. All those examples you mention evolve, with later versions adding features that require the interface to be added to. They aren't "fixed", they are "backcompatible". This also applies implicitly to any client for interop: you don't have to use the whole interface, just the festures you want. In effect, you are using different, smaller interface.