I’m going to decode this as I find it unclear…
No lasting effect - AD does not leave a multi turn effect on your toon, just lack of AP points from that single attack. Stun requires you to wait 2 turn or use a rush/Active to remove, assuming u have these in your team. In either case this makes you lose more actions.
For example, Would you attack a stun def or AD non-shield toon first (windowless team). AD because there is 0 chance of my toons being turned useless for the next 2 turns. Maybe if I’m running a active like remove stun I weight this a bit differently because I know I will kill a certain toon with my attacks but in general I would avoid the stun def toon. Even if I have stun swords, I have a chance at having multiple toons turned useless. If half my party gets stunned I’m sitting wide open to attack as well any special weapon ability I may have is turned off. Basically your losing part of your advantage.
Now would I invest in turning konrad into stun today, no. He would get downed by 2 hits from blue 6s. Wouldn’t much care if those 2 got stunned just to be done with the shield. In 5s days you would typically need to use an adrenaline rush to put a stun sheild down quickly.
Either way I wouldn’t use konrad unless you are sitting on Erika and hershel to keep him alive as long as possible.