Shop bought drones don't have arbitrary, often nonsense requirements. This one advertises that it'll work in 50MPH winds. How common are soldiers dealing with combat in 50MPH winds? It's likely there are other, similarly arbitrary and nonsensical demands that were placed on these.
Arguably one of the main differences between defence and consumer tech is dealing with the 'oh come on how often...'
You don't want to be caught needing your X or calling off operation Y because conditions are unfavourable.
It's kind of Pareto principle I suppose - they'll pay (say) 80% for that last rarer 20% of operational feasibility. (Likely more like 95-5, but I mention 80-20 as it's basically an 'aka' for Pareto.)
