I've noticed and thought about that too.
But while i would like to have the details of the DC and bonuses visible at a glance i find it a lot more suspenseful to roll an actual d20. And both need not be exclusive.
I would also like actual 3d dice rolling over the screen with different colors for each player in multiplayer. And of course there are times when you would appreciate an instantaneous result. Seems like small effort that would make a lot of people happy.
You could probably sell dice skins considering the infantile fascination many role players have with that good old twenty sided. I wonder if someone is working on a dice mod already ...
