For me, if you play even close to what I'd describe as "correct", conquest is easier, faster and less tedious than space. Cuir conquest is very simple - get the techs, produce units, move them, win.I frequently prefer to go to space than to conquer the world, due to me finding it less tedious (It takes less real time to go to space than to conquer the world). Thus I will have to do some research, resulting in my statement. Obviously my playstile does introduce a bias how I view a situation.
The point is definitely not to upgrade every cuir to cav. You will eventually get there but that is not the point.I do not think that the additional strength is that much better, since Cuirs will attack after Cavs, and thus attack weaker troops. IMO the increased power is the main benefit.
I don't thinkI agree that in this situation teching up to Rifling and then stopping research is probably the fastest (in #turns) way to finish the game. Even in this case it is probably more efficient to do some espionage with the Gold, to take out defences, OTOH this adds more tedium to the game. Upgrading Cuirs has a lower priority. Then again directly upgrading and skipping the espionage might be better, I do not know.
to revolt is necessary, but might be useful somewhere. Why are a few clicks (build spy, move it, use mission) tedious? I would assume if you win space, you need to do many "tedious" things with workers.You should never have democracy, and indeed most of the time PS > US. Whether buying beats upgrading is irrelevant, because they are not competing. You gain your production via whip.If one has democracy (for whatever reason, in most games going for democracy at any time is a mistake) buying Cavs (<360/cav, if one puts hammers into it first ) might even beat upgrading Cuirs (80
/cav ) (If one has the Mids PS beats US in almost any war). Buving a new Cav costs about 4 times as much as upgrading a Cuir, but provides a new unit. Since a Cuir provides 12000 power and a cav 15000, upgrading a Cuir increases the power by 3000. To match a new Cavalry one would need to upgrade 5 cuirs. Thus buying cavs is more efficient at increasing the power.
I've had one game where I tried buying cavs. It wasn't bad surely with an empire that has lots of FIN cottages, but I don't think it mattered much. https://forums.civfanatics.com/threads/nobles-club-226-victoria-of-england.655742/post-15699763
My conclusion is completely different. There is nothing you can do withSo while it is the easiest to manage, IMHO upgrading Cuirs to Cavs is a comparatively inefficient way to spend surplus gold.
except upgrade, that is why it's good i.e. better than all the alternatives. There are no useful alternatives really.

, but more importantl with electricity very decent commerce, for -1
), any village that is more than ~10 turns away from growing into a town when you get around to it should be replaced.
on immortal. You currently have 61 towns. To pay off you would need around 75 turns. Really the important point in time is the completion of the internet, since that will allow you to switch into it anyway. You are currently 11 techs away from computers, including optics. Optics, RR, combustion can most likely be traded for. Astronomy, physics, electricity and radio maybe. So lets say you have to research about 6 techs yourself and that one tech will take around 7 turns. That is 42 turns of research + ~10-15 (maybe 20, but 15 should be possible on almost any setup) to build the internet. Even in this very favourable setup researching democracy does not even pay off. Also early beakers are worth more, so to be actually an equal strategy you would need even more beakers.
. It's interesting that upping the culture slider can increase bpt, but I guess I have so much money coming in that I can afford it. That also explains why forgot to stop building banks. And why I'm not building science. And of course I can just pay for those catchy hit singles. About the improvements: I have a lot of Aztec cities with no food resources. Would you recommend shopping over the farms even there? And yes the GA is definitely on the books. I thought I could pull it off with 2 GP, but it looks like I already spent that one.