Yeah. But even though I wish this arc had been more detailed, people here in the comments were already complaining about the political direction the manga was taking. So I think the author was aware of that and decided it was better to rush the story at this point.
Not necessarily... They spent...5 chapters?... setting up the principle of this kind of warfare, and the way the group tends to resolve it. ( doubling as a history lesson in historical skirmish warfare...)
Without actually nuking everything.... Which they
could as superduperOP party....
We get one full example, two short runs, and then a summary.. Should they have spent another 10 chapters rinse-repeating the same thing? Don't think so....
There's still the greater "non"conflict that's playing, and now they drop the "there's fewer and fewer mages" thing as well...
On top of the Harem/Teritory building and half a continent with Stuff Never Seen Before...
This isn't "rushing"... It's simply cutting out uninteresting battles in a 5-panel summary given the end result was clear from the beginning anyway.