Also, the council will be pissed if I ignore a Dimension X defense mission. Fine.
But if I go to the mission and immediately abort it, then nothing. No malus.
I actually like this feature, personally. And it's not just Dimension X missions, either. Terror missions generally give you less of a hit for arriving and immediately aborting either. Like, there's kind of 3 different outcomes. The worst option, where you don't do your job and the council gets pissed. The best option, where you win and everybody loves you, and the middling option where you don't do anything but tell the council you tried. (ignoring the possibility of actually trying and losing)
It feels like a lot of the game is about knowing what fights you can take and what fights you -should- take and I like that the political calculations are part of that. Plus in the early game it rewards expanding your territorial coverage and in the midgame it rewards maintaining aerial dominance.