Right, with the future update of season 4, the Lui Lui Pao will enter, and there will be 3 trebushet. Although by terminology, technically there will be 4 “catapults” in the game hehe (they throw rocks). I think they should not limit themselves when it comes to models of catapults, trebushets, “more unique units ever is better”, just like cannons that come in all shapes and sizes.
As a defense of my argument, the model of the Counterweight Trebuchet is enormous, and the one used by the Mongols is also very big, a big versión of traction trebushet, and let’s not even talk about the Lui Lui Pao, that’s already tremendous, enormous, Pantagruelic even. The thing would be to turn the onager into a “mini”-trebushet, like the model I put up, one of those that only exceeds the size of people by one meter (in one of the images you can see the comparison). In theory, historically they were “mini-mangonels” that were usually anti-personnel siege weapons, not anti-structures. So practically it would be like a MOD to the mangonel unit, its data and statistics would remain the same, as its functionality of throwing many small stones.
ABOUT THE VISUAL CONFUSION.- Now about whether it would be visually confused with the large trebushet when building both… Well, you caught me there, I would have to test it with a MOD, one that turns the onager into a traction mini-trebushet, let’s see how is it. Hopefully some players will be encouraged to put a “Mangonel-Mod” to see how it goes, total, even if it doesn’t work we can have a laugh.
LAST SOLUTION.- in any case, the last solution would be to change the name to “catapult” (term that considers the onagers), or as the first comment suggested, to “Onager”.
The thing is that when they have to make other civs… especially JAPANESE, it will be quite clear that the Japanese did not have onagers, and then through wiskipedia we will find out that really in the Middle Ages both Asians and Europeans and Africans, everyone used a rock-throwing mini-trebushet and not onagers. But hey, it’s a thing for the future, they are just visual suggestions.
PS: The Japanese never developed the Counterweight Trebushet. The technology did not reach them through Mongol rule, since the #### managed to defeat the latter thanks to 2 hurricanes that destroyed the mongol fleet. Technically they did have “chinese mangonels” or traction trebushets thanks to their legacy of being a vasal state of China in the Heian era… but since it is a Mongol unique unit: ¿Do we share the Mongolian unique unit with more than one civs? or we give them one more version of traction trebushet, the Chinese version (which the Chinese no longer use, because they have the most powerful “Nest of Bees”), ¡YAIH!, ANOTHER TREBUSHET/CATAPULT unit. As a curious fact, the japanese clans replacing the rocks with Chinese grenades. It could even be a unique technology, similar to the English one for their stone thrower, if not, included with the weapon per se. Here’s a modern artistic recreation:
Fuente: Hoseki - japanese catapult (Hōseki (抛石) - Japanese Catapult)