Hihi regarding hq there is a consideration to be made, hq represents the infrastructure and logistic chain of command of any given army no matter who the leader is, the leader is the commander of the hq.
Therefore what IMO is wrong is that nations have a limit to the hq they can buy
they should always be able to buy a low level HQ,(let's say level 2) that would mean that as nations they have no longer good commanders but they still have the knowledge of what an HQ is.
this is important because in SC hq helps units quite a lot no matter the rating and in certain situations everyone is going for the kill of the hq knowing that is the only unit the enemy can't replace.
best regards