I can appreciate the practical considerations that require setting a precise time for an armistice to go into effect. However, looking at that first image in the article of the readout from sound ranging equipment just before and after the armistice, the thing that stands out to me is how pointless the last couple of artillery shells before a scheduled cease-fire seem.

I suppose without the benefit of hindsight you could argue that one side or the other might have gained a slight advantage with those last shots if hostilities restarted. But knowing the outcome, it just feels really bizarre to think about those last moments.