Yes but that’s usually something newer players will do; not pros. There is no point of having 4 barracks if you don’t have the economy to always keep them training. Depending on the value of the production building, let’s say a barracks, you could have enough wood for 4 or 6 more soldiers to increase your wood intake depending on civ. It’s a problem I see a lot with newer players and even some “veterans” make. Nussantara in particular will build 6 stables when he doesn’t have the resources to train from all 6 so one or more is always idle.

Yes, you do have to get gatherers and stuff, but then you can just build like 20 barracks or something; it doesn't seem very economical to me. That's fine if you don't change it though 

Should I add advanced cav for every civ?

Perhaps GitHub could be an option?

2gb to the forum is too large, IMHO. Eventually we'll be porting the forum over to new software and having massive files like this may create issues (or maybe not).