Magitek itself is hundreds of years more advance than our world current technology.

It can create holographic images resulting in the creation of holo computers.

It can create energy beam weapons for infinite ammo weapons as long you don't over heat the weapon.

It can create flying battleships without windows!

The lack of this being wide spread in FF14 world until current events can be linked back to the use of Magic as Magic covers a lot of things that advance technology can achieve and more so people never see a demand for advancing technology and Science due to Magic providing the same thing or better with less effort.