Necessary? No. If your looking to get high, you should be doing it.
It can more than double your potency. Just bake it at 220*f for 20 minutes... Then cook into whatever oil, however you are comfortable.
Try it small scale, one day do one without decarb, the next day one that has... The difference is crazy, you won't be disappointed. If anything, you will see that you can scale back in recipes.