It's not a game changing thing. It's more to be excited for what your troop would look like. I thought it'd be cool if when you were going to upgrade a troop in the lab, you can see what the troop would look like when it is done upgrading.
Take giants for example. There is a huge appearance difference between level 5 giants and level 6 giants. I know it won't work for spells because they are...well, spells, but I thought this would be a cool little feature.



