Calling trench warfare stupid because of conceptual obsolescence seems suspect. It was a new problem with no obvious solution. Trench warfare in the US Civil War didn't end in such a stalemate so there wasn't much precedence, There were newer automatic weapons and a vast scale of the armies covering an entire front that hadn't been seen before. A stalemate might have been the best available outcome at the time where…
Tactics evolved a lot during WW1, e.g. creeping barrages and shock troops. It was also the first true industrial war. It saw submarines and the first combat use of aircraft, in bombing, close air support, recon and air combat. And it let to the invention of the tank. Haig so, for all his support pf veterans after the war, IMHO never understood what he really did. The Germans wanted a decisive battle, which they didn'…
"But to me, World War I is the dividing point where modernity goes from
being optimistic to being pessimistic. Because when you put the words
"machine" and "gun" together, they both change. At that point, war is no
longer about a sense of adventure and chivalry and a way of testing your
nation's level of manhood; it's become industrial, and horrible."
[1] https://en.wikipedia.org/wiki/Dieselpunk