[quote=@Izaka Sazaka]
<Snipped quote by Robo27>

This is true, though we did see automated defenses in the anime in the form of those automaton knights that defended the passage up through Yggdrasil. 
[/quote]

Yeah, but do keep in my mind they were monster mobs, it's not like they were created by one specific race for the intention of war. 

Also to build more on my point, if there are tanks and warships what will stop someone from making a gun powered by magic? After all tanks and warships would mean the technology and ability to make a single handheld gun powered by magic isn't impossible.