We do take it seriously; it's a hard tradeoff between Novelty and Utility. Given that the whole point of macros is to change the semantics of the Python language, this (valid) criticism applies not just to case classes but macros in general. If you go haywire with macros, all hell breaks loose.

We think that with some discipline, it is possible to come up with macro transformations which are both useful and understandable by a programmer. This means setting clearly defined semantics for the transformations, which is difficult but doable.

If you think macros are kinda crazy (well, they are!) you should look at the implementation of such pythonic constructs like `namedtuple`, the `ast` module and the new Enum library coming out!