Core (in CAS) vs. Divisional Studies (gen ed?)? How hard to double major?

Would like opinions on the Core curriculum program vs. selecting your own electives through Divisional Studies. On one hand the core sounds like it provides for great discussion opportunities but I have read a few criticisms of the program and comments about it being ‘easy’ and not challenging as implied in the program description.

In general, how feasible is it to double major or major w/ minor in CAS? My S is interested in both economics and CS. But if there are a lot of ‘required’ classes, I’m worried both subjects could get too watered down.