As a 5e skeptic, I like some of these answers. The magic frequency dial sounds precisely like something I might want to use for a high magic game, where even the fighter has a theme that lets him sling around magic bolts.
I hadn't been a fan of the new way they are doing skills, but this answer actually makes quite a bit of sense now. Even in other skill based systems, I sometimes run into the difficulty of a character in a thieves' guild trying to find out information, but he is not trained in any persuasion type skills, and I end up hand waving it to use thievery which doesn't make too much sense as a dexterity based skill. With this method, I can just ask for a charisma check, and allow adding the skill bonus for thievery. I like this quite a bit. But I wonder if there is a better way to present it...