I appreciate it can change your strategy. Sort of means you should put weaker fleets up front and stronger behind on def as they have to use full fleets to beat your weaker ones (or at least a fair number do) and they are left with partial ones to finish off the back. Even with all ships unlocked I am not sure it is possible to have one defence and two full offence squads, there just aren't enough ships. Even if it is the majority will not be in this position. I know you don't have to use the reserves to attack but even so.
Really it is probably more my OCD that it is just inconsistent plus ship numbers may be a crunch point more than with toons.