Cog is coming with the new tech tree. It fits between the Galley and the Galleon.
I would not do an early Submarine. If it was only done once and had very little impact, then it's probably not appropriate on the scale of a Civ game. Subs don't really have an impact on warfare until WWI, which is where the Submarine Warfare tech is.
I like having the Can Explore Rival Territory ability on the scouting ships - Caravel, Brigantine, and Sloop - but I would take that ability off the Fluyt. The Fluyt is a cargo ship and the ability to transport military units and explore rival territory is the signature of the Portuguese UU. I personally don't see why the mechanic is broken. What is wrong with it?
I would not do an early Submarine. If it was only done once and had very little impact, then it's probably not appropriate on the scale of a Civ game. Subs don't really have an impact on warfare until WWI, which is where the Submarine Warfare tech is.
I like having the Can Explore Rival Territory ability on the scouting ships - Caravel, Brigantine, and Sloop - but I would take that ability off the Fluyt. The Fluyt is a cargo ship and the ability to transport military units and explore rival territory is the signature of the Portuguese UU. I personally don't see why the mechanic is broken. What is wrong with it?