It's interesting, this is true in the early days of the show but around season 4-5 it's clear that while the humans (of earth) are still technologically primitive, they essentially are making use of huge swathes of the American military industrial complex. Especially in terms of r&d. Theyre also not beholden to centuries of rigid doctrine around combat. So even though a staff weapon is far more technologically advanced than a gun using gunpowder, the gun is more ergonomic, more usable, more accurate, comes in specialized forms, etc etc. Plus they can implement novel tactics like shooting laser guided missiles through the gate and painting targets with a laser.
That show was pretty cool.
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