The other victories can try to jump directly to Rationalism after finishing their opening tree (perhaps with a short detour to Consulates) without missing much of anything. Whereas with a CV you have the entire Aesthetics tree sitting right in the middle
What if I told that the most efficient Social Policy course for culture victories is to completely ignore aesthetics and plow through rationalism until freedom and then pick up your last policy in Rationalism and Oxford to get your last few technologies. There is absolutely no room for aesthetics. Frankly Aesthetics should open in the ancient era just like piety.