>However, the part that is not really discussed on these books is that we should be vigilant not to "over-abstract".

To be fair, I've never really seen any process/paradigm address this. I've mostly done it based upon gut feel - sometimes abstractions seem like too much of an imposition. Other times it feels critical.

DDD just says "do way too much. all the time".

I imagine one day there will be an abstraction calculus but software engineering aint there yet.