Giving full revolution mechanics to Aztecs is too drastic. They’d better get a “revolution card” like the Inca/Indian/US ones.
Earlier revolutions for European civs might be a solution. I wouldn’t argue if you think that is a better one.
But as I mentioned in the exact same thread, though I’d happy to see more “historically accurate” stuff myself, it is far from a major consideration since the very beginning. No AOE game is ever synchronized within and among civs. That gap existed ever since (Portugal unlocks Napoleonic era cazadors and medieval organ guns at the same stage).
As it is already the case, moving towards “more historical accuracy” is not a necessary step to take, though some might prefer it. And if it limits the possibilities for future expansions of the game, it should come as secondary in the priority list.