Fire emblem is a great game but:
Boss battles like ones in xenoblade
Complex castle designs (or a realistic design like the kempf map)
Rage- I mean enemies and allies hit harder and get more fragile due to their rage towards the enemies. This adds a sense of realism#
An rng system for enemies like for example an enemy can roll 16-18 strength like in thracia how enemies sometimes have different move to the other units of the same class
They're just minor nitpicks though ^^