I *require* my players to use pencil and paper, for two reasons:
1. Creating a character for the first time, and having to level it up manually means you actually had to go look up the ability and write it down, and not just check a box. More than once I've had players not know what they can do because they had a tool put everything together automagically.
2. Phones, tablets, computers, game boys, iPods, Commodore 64s, and Babbage machines are not allowed at my table, nor are things like them. It's too easy to get distracted, and I'm not just talking about during combat. During role play interactions where the party is talking to Someone Important, inevitably I have to repeat myself because someone was playing on their Atari 2600 and not paying attention!!!
I realize this may seem Draconian to some, but I'm the Dragon Master!!! And these are my friends. If I was running Pathfinder Society stuff then I'd just roll more nat 20's against someone who wasn't paying attention :-P (not really, but I might threaten it)
Thank you for this, well said.