I play using slow motion so much, and I also have various UI elements enabled.
I can't truly appreciate the unit animations, battle scenery, and the sounds of the combat when playing.

Watching a replay requires the player to exit the battle to load into the campaign map, and then exit into main menu, then watch the replay. And the player needs to load into the campaign, in order to continue playing.

This process takes so much time to watch a single replay.