How would you balance it though so that it makes sense, that's a question as well.
Like, i can imagine The ''Tech'' side would've an advantage as their tanks would be immune to most physical weapons.
Hmm
And how do you differentiate units from each other so that they aren't just reskins?
Example: Archers would be 2-3 Range, but attack diagonally, while Rifle duded would've longer range, but can only attack in a straight line. Sniper rifles would be super long range, but have a recharge time ala Hyper beam, while Siege magic is same as usual
And then we get Pegasi vs. Air Fighters..Wild xD
That would be cool as well. I think FE needs to venture more into high fantasy and magitech and less into ''medieval but with some magic and dragons''