And when you compare 3/5/0 to 1/1/0 it looks more attractive. Especially when you consider the permissiveness of the environment. In order for a Maxim or Karnov to be more appropriate you have to be reasonably assured that it either 1. won't be the primary target (unlikely considering the bag of goodies they're carrying), or 2. they won't be hit. The only way to guarantee the latter is to deliver infantry on target before the enemy is in range (no mean feat if the map board size is proportional to the force). What happens if they are in range? Well a few rotor hits or skirt strikes later you either have your infantry spread across the countryside like jam on toast or they're in a box on the ground waiting for the turn of consolidated fires that will turn them into cinders.
Will the Trajan attract fire? Probably. Is it a more attractive target than a Karnov? Dunno, depends on how much you like seeing whirlybird birds take tumbles. But it provides some infantry fire support, can deliver two squads of BA to the field, and has enough armor to take the odd hit or two (compared to the Karnov which can't).