I think keeping it simple leaves a bunch of problems on the table we can fix. Doing exactly what you said would result in:
- The units still coming too late (Medieval expansion is really in a bad place IMO)
- The cities still sucking and being culture and happiness sinks
- The build and upgrade strategy still being very powerful and exploitative.
Those are all problems I'd like to avoid, and think we can if we don't settle for simple and go for the gold.
So, for Medieval expansion....do we want to buff medieval expansion? It doesn't fit thematically for the Pioneer unit to be in the Medieval Era, and I think it would fit better if the Medieval Era is where you war over established spots, not settle new land. I understand that civ doesn't have to be a perfect representation of reality, but I don't see why the Medieval Era needs to be a continued era of expansion, either thematically or gameplay wise.
As for the cities being culture/happiness sinks. Well, this is for your empire to resolve, Pioneers do start with additional infrastructure and population to catch up faster, but giving permanent bonuses exclusive to pioneer/colonist strategies feels somewhat gamey. Your choice to expand should be based on your current situation and the decisions that led up to it, I don't think there need to be any inherent bonuses to pioneer expansion other than a faster start to catch up faster.
The build/upgrade strategy would be slightly nerfed on one hand in my proposal because it would be harder to build Settlers in the Medieval Era because their costs scale, but would be buffed on the other hand because it would be easy to upgrade it into a Pioneer. I considered making it straight up impossible to upgrade Settlers, but then the AI might have built Settlers and have nothing to do with them (or use them to settle weaker cities) and it could cause problems.
I think (not sure exactly how this works), right now, upgrade costs are based on a formula that calculates the difference in
Production requirements between the base unit and the unit it upgrades to. If it's possible to not use this formula and instead set the upgrade costs to be something high, like say 800
, that would nerf this quite a bit. Otherwise, I think we could just leave it, I mean right now it's possible to upgrade an Emissary into an Envoy for basically no cost and I don't think that is too unbalanced. There is opportunity cost for rushing banking to upgrade Settlers to Pioneers ASAP.