Soldiers are the way to  go for a banker. However, Just remember that 100k droids are better than 349k soldiers in attack. If you are likely to be doing any attacking... you will need droids.

You are right, they changed it

The terms 'banker' and 'attacker' are arbitrary: With small family sizes it is vital that every player attacks. I'd rather my 'bankers' had some sort of aggressor feature and reduced another attribute slightly, because I want to maximise 990% (or whatever) of morale, to take the planets efficiently.
Unless playing a standard race, I would say Droids are a must.

You can disagree ... whilst my bankers take your planets.
remember Revalon and Partaxian do not have droids. So in a fam of 12 in MW you are likely to have 3-4 people already with these two races. Your other bankers could be resourcers or Cash, but for a Cf/Pop-switch banker to have droids, it only requires a small decrease in science.

I played banker to an extent this round, with droids and 10% attack. In a big war I was able to annex 75 planets over 2 ticks. My attackers did a fantastic job... but in IC, wars are won through a combination of morale and military strength. If only 5 people in your family attack, and 7 attack in the other family - you will always struggle to win.

I pointed out awhile ago the information concerning Soldiers and Droids.

in a straight up fight, D v S it's a 1 on 1 thing, and it comes down to who has more. However, once attack bonuses come into play, your 7 pt droid becomes 10.5 with 50% and with another 50 from research is 14 and will pwn 3 soldiers before being killed. 3 1/2 actually. so you have 7 soldiers killing and being killed by 2 droids. How's numbers for that?

s v d is 2 v 4, so you have 2 soldiers taking on 1 droid. So most likely you need double the attack force for that of the defending force. that's alot of ground. Now assuming you're a Revalon, -30% of 2 is 1.4 so you suddenly just went from 2 soldiers to 3 soldiers, and your last soldier is hanging by a bare thread when that last droid comes around the corner and taps him killing him but gets some blood on the droid, causing it to rust slightly

in such case you need 3 times the ground the enemy has. More so if they have military research, which is likely. Now you're pretty much screwed unless you have high ground or you don't hit a portal or they stationed. Pray. Hard.

Now the tricky thing next up is that a Rev hitting another Rev portal, 2 against 7. that's what? 1.4 against 7. lets bring about some numbers here, 3 = 4.2 6 = 8.4. so 5 = 7 so you need 5 soldiers to take on 1 enemy soldier. since you have -30% attacking and they have 0% defending. See where I'm going? Yeah, it's a game of numbers more than anything else.