I obtained both planetary bombardment (PB) and biological warfare (BW) in my recent play through, and noticed something odd. PB reduced resistance on a planet while BW reduce defense. This doesn't make any sense, shouldn't PB reduce defense instead? And BW should just kill the population outright, not reduce resistance IMO. I'm currently finding it impossible to defend against BW at the moment, unless I/they get the vaccine tech.
Information warfare (I hardly ever get it) functions depending on the planets approval if I remember correctly, but does it alter defense and/or resistance? Would make sense if this one affected resistance right?