I'm not convinced that Inspiration is actually a rule of the game. I mean, it has zero interaction with any other rules, and it only comes up when the DM explicitly decides that it comes up. If the DM doesn't actively go out of their way to apply it, then for all practical purposes, it doesn't exist.Well, you got inspiration though so a kind of lucky feat light. I like both, and with inspiration I gladly allow it to afflict rolls made by me the DM or some other player. It is a twist of fate style mechanic which complements the else strict rule set of 5e in a perfect way imho
It's a lot like the random item charts, in that way.