To bit or not to bit

It's all about the gear! I go from saddle shopping to bridle shopping. I am riding and riding some more, I couldn't ask for a better summer. I have great riding partners on the trail and when working in the arena, I am seeing a lot of progress. I basically am doing Clinton Anderson drills and patterns in the arena, which entails lots of hind quarter yielding in various forms and lots of bending and flexing. She has gotten very soft and responsive to my seat and legs. I have been thinking a lot about transitioning her to a bit, but wondering why I need to. She is so soft with the halter, I am considering trying a bitless bridle or bosal at some point. Two years ago, I never would have dreamed of riding out on the property let alone trails without a bit, but her training with the rope halter has made her so soft. I have some people telling me not to give up on the idea of a bit. Maybe a bit and bridle will give me better results??? Just wondering what my fellow bloggers think about bit or no bit?