Well that’s different. So what you’re trying to say is that Germany fell apart after the war which is absolutely correct. Back to my original argument, WWI led to enormous social change that sparked the technological progress which led to the lifestyle we now enjoy. In Germany particularly democracy and progressive ideals had been supressed for generations, but after WWI this was no longer possible due to the chaos you describe. Additionally, an affect of both world wars has been the spread of democracy by the victorious powers of Britain, France and the US.
Again how would the world be different without the world wars. I think it would be more backward, less changed, less democratic, more imperialistic, but perhaps more stable because Democracy tends to breed instability.