A lot of times I have to remind up and comers to apply conventional BJJ technique, instead of going nuts and inventing their own random technique on-the-fly. The wisdom behind that is simple - those who came before us developed those techniques over time because they work. When I roll with a blue belt and he's using crazy wrist locks to prevent his guard from being passed or creating odd tie-ups from an inferior position (e.g., he's stuck in side control), I generally question it.
All of that is fine and usually true, but the flip-side is that, in BJJ, anyone can be an innovator and any technique, as long as it works, is good technique. In many ways that contradicts concepts of staying true to time tested technique and that's OK. We all have to strike the right balance that works for us.
Take, for example, the Iron Hook techniques we've featured here this past year (here and here). This is fancy, esoteric, voodoo-style BJJ, but it's also legit, effective and gettable. Their creator, Adisa Banjoko, is not a world champ, a Gracie descendent or a BJJ forefather. He's just a righteous purple belt who came up with some dope sh%t that works. Check out some adaptations of Adisa's Iron Hook as demo'd by black belt, Mike Bruce (Tim Bruce Jiu Jitsu/Jupiter Jiu Jitsu/Rodrigo Mendes JJ).