Yeah, Horses for courses. If all out power is your aim then RBs are an option (Not the only option).
My reasons for staying with the L are:
1. That sound. Way better than an RB!!!
2. I own 2 L powered cars so I can swap bits if something dies.
3. There was no conversion required and it retains some of the lineage of the car.
4. Simplicity, I am no mechanic so simplicity is important.