No justification for weapon technology. You go from a butter knife to a plasma sword that shoots OMG cosmic particles across the map in a world where people are still riding horses.
And if it's justified sometimes the justification is just "Magic". If they call it "old" or "ancient" magic, then the fans will call it lore.
I have mostly given up on trying to find good writing in games.
EU is the only bros defending worldwide tech rights.