This is a very good point that I see people miss quite often. Evolutionary pressure doesn't mean we adapt to optimize lifespan and health in our environment. The primary driver is the survivability of subsequent generations, not to reduce suffering.
Combined with reducing snacking in general (2-3 meals a day) and a longer 3-5 day fast once a quarter, we'd all be better off regardless of the macro profiles.
I do feel that a lot of people getting more calories from protein than fat is a bit lopsided though. A lot of natural sources of highly available protein are accompanied with 0.5-3g of fat per g of protein. Meaning calories from fat should be higher than protein (9c:g vs 4c:g).
It might be true even today, let alone in the caveman era.
Maybe our advantage was that we, unlike other primates, had a lot of individuals even only making it to 40 years old in the distant past before they got eaten by tigers or succumbed to all manner of mosquito-borne diseases et cetera.