Good observations. Building storage does make sense, but it is very expensive and time-consuming.

You make a good point about snipers and bazooker guys beimg good defenders, condisering the defending team gets first strike. There will have to be a balance of strong defence score units to take the counter-attack blow from the attacking team also. The more you think about it, the more complicated it becomes, especially factoring in the units' resource carrying capacity, and how many missions a unit needs to survive to bring back a positove return.

It make sense to pick your targets wisely, and have a strong defense force while you're upgrading storage.