Were there any benefits to society from World War 1?
The war stopped the German attempt to take over all of Europe.
That certainly seems like a benefit to society. The war also forced
the improvement of aircraft which still continues to improve.
During WW1 aircraft were first used to spy on the enemy, then the
enemy put guns on the aircraft to shoot down the spy plane so
aircraft continued to improve both in power and reliability. Before
the war, airplanes had been just a novelty, more of a hobby.