Lets face it guys: some players prefer tanks and these are the only land units they buy. Other prefer infantry.
Talking about naval units some players buy only submarines, other only battleships.
Consequence: a players army has only some types of units.
That´s not real.
A possible solution is to give bonus to variety. For example an attack using all types of land units would recieve a bonus (a little bit like combining infantry with artillery in actual rules).
A naval battle using all types of naval units would recieve a bonus.
Combining naval and air units would recieve a bonus.
Combining land and air units would recieve a bonus…
This way we would be tended to use multiple types of units.
Tnaks guys…