If you agree, a torching attack instead of the hitting the building with the sword, could be a little more immersive, both for melee infantry and cavalry. I'm not suggesting any gameplay change.
If you had played AoE3, you know what I mean (by the 5:20 mark, where it should start the video)
I suppose that archers could use the same animation of their attack, just with added particles of fire.
A video talking about the real history of fire arrows (from his POV)
The problem would be slingers and skirmishers, that have a bigger range to throw torches.
Melee infantry could break the walls with a pick (and cavalry could use an animation similar to the dismounted food gathering while chipping the fortification)