I am one of those, the majority of my games being WW2. However being interested in WW2 tactical is not the same as being exclusively WW2 or even a majority of interest being WW2. That's the first thing.ASL's core audience is people who like World War II tactical wargaming. Stop trolling.
The second thing is that WW2 starting style combat is the result of early-mid WW1 experience combined with '20s and '30s experimentation. Indeed the greatest effective changes I feel occurred during WW2 (not pre war) as a result of practical experience. Nations did not enter WW2 with the optimum arms balance. The Germans for example started with a Pz Div with the equivalent of 4 Pz, 3 Inf and 2-3 Art battalions and ended with 2 Pz, 4 Inf and 4 Art. Ditto the British, Soviets and US started with tank heavy Tank divisions and ended with more balanced Tank units. All major nations changed their OoB for humble infantry divisions during WW2, sometimes fairly drastically at low level.
Thirdly WW2 style and ASL compatible combat bleeds all over the '20s to the '60s like a stuck pig in a slaughter house. There was no case of "OK, WW2 is ended, stack your pikes, we only use short swords from now on!". The intermittent peace in the '20s and '30s still was interrupted by clashes (especially in China) and some historians have used the term "The Great War", not in its original usage of WW1, but to encompass the entire period from WW1 to WW2 or even to Korea. There simply is no clear cut off either in political terms or in terms of equipment and tactics.