Although even Aether Revolt was pretty tame overall. The consulate forces despite the crackdowns and such fight using almost exclusively nonlethal tactics, as do the rebels, apparently. There's a fuckload of property damage but Baral and Liliana appear to be the only people in the story actually trying to cause casualties on either side. The revolt is based more around ousting a corrupt faction in the consulate's energy department than the overthrow of the existing social order, and after Tezzeret flees to Amonkhet, the two sides quickly reach an understanding. Aside from Kambal losing his job to Pia as a concession to the Renegades, it appears peace is restored surprisingly easily once Tezzeret is no longer in the picture.
Kaladesh/Aether Revolt is very blatantly a breather episode. Things were very high-stakes in the last two blocks with Eldrazi devouring everything, and SOI was pretty fucking dark, although most of that is focused on how the normal people on Innistrad are fuuuuuuuuuuuuuucked now.
Kaladesh gives us a bright, optimistic story and some feel-good moments for Chandra and the others while at the same time setting them up for a fall when their victory there spurs them to unwisely attack Amonkhet. It's the classic "the heroes have won some major victories, but in doing so put themselves in a situation where they have to cross paths with the big-leagues villains and promptly get their shit pushed in as a reality check." I'd put money on it, Amonhket is going to go very badly for the Gatewatch.