Which is why I suggested implementing a model similar to what was done in Fates. You can save scum on easier difficulties. But if you're looking for a challenge, that sort of thing won't fly on Lunatic/Hard Mode. And if it is a remake for current consoles, I imagine some sort of online/multiplayer element would be included anyways.
With such a huge roster I would also like to see more unit differentiation outside of bases, sprites, and growth rates. Some suggestions would include unique max stat modifiers and a personal skill for each unit: maybe Roy having unlimited uses with his Rapier, Gonzo's hit rate of his equipped weapon doubles when remaining usage is below 50%, Rutger's equipped weapon gets a +20% crit rate on the enemy phase, Alan gets +3 damage when there is another mounted unit within 2 squares (these are just some rough ideas for some personal skills).