So can we get a clarification on this: The effects of upgrades of Napoleonic warfare like Limey Warfare and revolvers carry on to Rifle Infantry? If they DONT then I suggest that anyone that has both upgrades purchased be granted a discount so they only have to pay 4-6 IC instead of the full 8 due to them buying the upgrades in between while others didnt, so they dont have to update their armies so drastically.
If they DO carry over, then can I suggest they only carry over to the immediate level after them? For example, revolvers could carry over to rifle Infantry, but once the next upgrade becomes available, they become obsolete, forcing you to buy the upgrades for either the new level or from Rifle Infantry, or both.