I think the problem for med school admissions might not be that UCs are “brutal.” Maybe it’s more that there are simply so many CA residents applying as medical school students.
I am not sure if CA residents can compensate by attending an OOS school, as you mentioned. Here is a thread that I found interesting, where @WayOutWestMom mentioned that regardless of the undergrad school attended (OOS or IS), a CA student is still a CA student, with the disadvantages of applying from a state with a very large number of med school hopefuls. I don’t know if the reverse of that might be true for an OOS student attending a CA school.
As far as this other comment,
My son who is currently attending Cal has wondered if this “notoriously brutal” reputation is fully justified, as he really isn’t seeing a Hunger Games-like atmosphere in lower level math and sciences.
Do you happen to have experience with UMich to compare? That was my question.