I haven't been very active and probably won't much anyways. but that aside;
I personally think that FE games need to show a little more of teamwork related skills (that is essential to play) rather than just using a support system that is really just a character morale/performance buffer. Such as co-op skills or three-way and the sort on up, formation type teamwork that fortifies defenses to ward off projectile/ranged attacks where positioning matters. Since in FE games, you can basically have just a one man army and still win, but just in late the game. So then, what say others?
As for magic related, I prefer the separation of the 3 base spells as they can potentially trump the other style. But to take the magic system a little bit further, IMO, would be to make it so you must use a certain element in order to hamper another magician's attack. IE, use fire magic vs a wind magic user, fire will distort the wind magician's ability to properly attack that round. Basically your attacks will clash at the same time during battle phase but the one with the proper attribute WILL win. To me, FE need to make use of their paper-rock-scissors system so that the penalties/bonuses make a tactical significance since the one difference in power can easily be overpowered by a strong unit, at least in the magic department.