Right, in athletic sports, you're supposed to get by on training and skill. Drugs are seen as cheating. What sort of enhancements would be seen as cheating by gamers?
A few cups of tea might just do all of these better than drugs would. And things like L Theanine or creatine don't really need to be banned.
I would imagine that Adderall would be useful for TRAINING for games, if you need to practice some repetitive task over and over (I'm thinking of ssbm here). Not that this warrants a ban.
I think the gear would give more of an advantage over drugs since it would be more consistent.