A combination of the above. The tangled treaty web and the end of the taboo on nuclear weapons that lasted the first couple of years of Bob's existence means global conflicts are massively destructive. The mechanics of progress are such that most rulers feel compelled or are encouraged by alliance leaders to rebuild to pre-war levels and restock their coffers to prepare for the next one. That takes most of the year.
Small, limited, frequent conflicts would be more exciting/compelling, but would require:
a less tangled treaty web and a move away from the hegemony of established powers toward a more fluid multipolarity;
more agile and intelligent diplomacy;
less automatic resort to nuclear weapons;
some adjustments to the physics of the world so that sunk costs were no longer so heavily privileged