Not to mention as Shemska alluded to - it's the higher ups that would order thousands of monodrones and other lower modrons to march on and level a town. For those low caste modrons, they won't relent, they won't hesitate or question, they won't be bribed or distracted - they just have orders to destroy the town. There is no malice as well as no sympathy. Just the orders. If they are ordered to destroy a town, none of them will turn back until every single wooden plank in that town is shattered and there is nothing but a barren field. The only way to stop a lower caste modron army in that situation is to kill every single one of them (or deal with their bureaucracy in getting the orders rescinded, but good luck with that). That's very frightening in a borg/replicator sort of way (admittedly, both of those are sci fi concepts, so I can understand with thinking they don't fit in a fantasy setting for that reason even if I disagree).
You make a good argument for why characters should fear modrons. This does not change the fact that players are apt to fall over laughing (and lose all immersion) when told their town is under attack by dice with legs. There's a reason modrons usually end up being used as comic relief.
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