This doesn't make a ton of sense to me, though. Role-play, sure, but having Rome collapse and give way to Normans/HRE/Byzantines/whatever and then into modern-day European nations is more historically immersive than it was before. Obviously not a perfect 1:1 representation of real world history, and the leaders potentially not lining up is still weird, but closer to reality than how things were previously. Surely seeing Rome led by an immortal Caesar neighbouring Lincoln's America is very immersion breaking?
Not to say people can't dislike the ages system; everyone is entitled to their opinion. Just that the specific historical immersion point hasn't made much sense to me.