I have used similar versioning strategies in products... Barring something special in the app, these kinds of plugins are not for the user or customer. These k

I have used similar versioning strategies in products... Barring something special in the app, these kinds of plugins are not for the user or customer. These kinds of plugins are for the development shop that makes the product, reuse across their product portfolio, and managing custom adaptations of the software for their specific customers. Breaking APIs in this context is just like "breaking" any other internal API, as bother the caller and callee are upgraded and deployed together.