Suggested by Tine Staric – Needs Votes
We can have Codeunits as implementations of Interfaces, but since we can declare procedures on Page, Table, Report, and Query objects, I see no reason, why those couldn't implement interfaces as well.
Right now, if we want to decouple for example which Query is being used in the process, we have to wrap it in a codeunit. If Queries could implement interfaces, we could skip the wrapper. The same goes for decoupling other objects.