You don't need to, but personally I found the system of rolling the sail around the boom to be quite awkward to use at sea. I had reef points fitted last winter, and sailing her when rested is much better now, it's easier to do and the sail sets better. It is also important that you either add a second haliard point on the gaff for the reefed sail.
I would also suggest rigging some sort of lazy jack system, as reefing with the whole lot sliding around on the transom or gunwhale is quite challenging!
This is how mine looks reefed, it is worth getting the reef points done in my opinion. It makes reefing a lot easier.