The question of losing/keeping promotions will keep coming up. I think it best to speak my mind and explain my position on this question in general. I will try to be consistent in this philosophy's application in my own proposals and opinions.
Months back we had a disagreement on the forum with G concerning losing/keeping unique promotions, specifically on the Mayan Atlatl. I was on the side advocating that the atlatl strike promotion should remain on the unit because it was the only Unique promotion in the entire CBP that was lost on upgrade that wasn't hard coded to a unit. We ended up not only failing to change G's mind on the atlatl strike, but we got legionnaire pilums nerfed too. It left a bad taste in my mouth.
Now we've gotten into this a little and the discussion of unique promotions, and whether to keep on upgrade or not, keeps coming up. I need to say I'm firmly in the camp of keeping everything we can, unless it is absolutely ludicrous to do so. Unique units should be most powerful in the era that they become available, absolutely. That is what bonus movement, attack damage, and other unitType stat buffs are there for, however. My reasons for why we should try to keep unique promotions are as follows:
- it's generally more consistent with what is most common practice within the existing CBP
- If you are not in a position to make war in the era that your UUs arrive at, then there should at least be some reward for keeping them alive.
- Promotions enhance the feeling of uniqueness for civs further into the game, even after the unit models are lost. Reduces the feeling of playing a 'generic civ'
- Players can assign more importance to "legacy units" and keeping them alive. This imbues these units with a sense of military tradition that reflects real military institutions such as orders, veterans clubs, military doctrine, etc.
- UUs that don't have unique promotions are dead-weight if they are City-state gifts. The Atlatlist for example, is gifted to you even after you have researched crossbows, and doesn't keep its promotion. You either delete it for the gold or upgrade it. The CS gave you an obsolete unit you have to pay to upgrade yourself so that it can become a generic crossbow. yaaaaaaay...
- As @Funak put it "[Even if it makes no] real difference in gameplay it lowers the desire to make war; it makes the civ feel defensive and boring.
- It's more"fun", gives players a mechanic or side-mission of preserving these special units and making them stand the test of time
So every time this question comes up, you likely know what my opinion will be. Hell, if I had complete control over this modmod I would revert the pilum and atlatl strike changes myself. If the only decent argument against this a vague notion of 'balance', well we're borking that up enough already.
Some examples:
- keep spawn workers on kill from eagle warrior. (works with Aztec warfare prioritizing captives)
- keep Hashemite damage on pillage (Feels vaguely terroristic, which for better or worse has been ascribed to that culture in the 20th century)
- keep Koa's 'bleed' damage on attack (look up Kapu Kuʻialua)
- Drop scythes after upgrade from the scythed chariot? sure, the unit upgrade for that unit doesn't even have wheels, it would be like keeping feared elephant on India's war elephant after it upgraded to cavalry