I know it'll be months before the next one but I want to put this out there early.
With the last 2 Strikes containing some kind of modifier, I feel that there should be some sort of baseline on what the "regular" BS experience should be. With the Raiders and, to a lesser extent, Silver Wolves, modifiers help spice up fights against limited unit rosters. However, the Rebels have a much more expansive variety of units to field compared to the previous factions.
With this, I feel that modifiers aren't really necessary to get the full Boss Strike experience. No modifiers, no environmental dot, just our armies vs theirs.