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@lispi314
It's interesting that lisp retains basically maclisp compatibility, but also has CLOS. I think that what you have said about CLOS is relevant when implementing and exposing your package's previously agreed upon protocol implementation to users (in this case, application programmers).
There is however the different scenario: Making original programs, in which case by definition we don't know what will turn out to be the right move right now, and we can anticipate needs changing.
@pkw