I think the problem with SS's versus SDD's is that SS's are way too expensive - it should cost hardly anything to put a bunch of guards on a starship (compared to the cost of the starship itself), and it shouldn't take much space, either.
In my mods I keep boarding parties more expensive though because they need to include equipment to break into the enemy ship and to survive inside the alien ship, and to be able to take over its controls.
If a SDD is able to knock out enemy SDD's reliably, then the chance to capture enemy ships (even ones with SDD's) seems like an effective use of space. Not that that's a big problem - I despise "rock-paper-scissors" anyway.
I guess it'd make sense to have two flavors of SDD - ordinary and then Versions equipped with bomb defUsers. Does it need to be in an SDD to work, or can it be in a special boarding party that damages SDD's? (I don't understand the logic/explanation behind an SDD that destroys other SDD's).
PvK