A 365 project is confining, at least mine is the way I've defined it. As a photographer, confining isn't always comfortable. One camera, one lens, one film. I so want to be free to shoot whatever I want to but my own rules for this project don't allow me to. That includes shooting with my digital camera once in a while So, first I have to make sure I have a project shot that will work for the day before I can even think about shooting with something else. Usually I don't have much time to spare beyond what I can devote to getting a workable image. Some days I can't wait to get beyond the end of the year to really get to use my other cameras.
Confining on the other hand has its pluses. I'm so tuned into my Leica MP with a 50mm Summicron lens exposing Kodak Tri-X. I am now able to pre-visualize my results so far beyond where I was when I started. I don't always nail it but for the most part I understand why not. Shooting with film is such a different experience than using a digital camera. You've heard all the analyses of why shooting film is such a different experience. It makes one slow down, it focuses the photographer towards a higher sense of composition and forces one to avoid just shooting with abandon trusting that one image will give the results you're seeking. All these reasons are true but for me the pre-visualization is most important. Seeing a scene and knowing the results you can anticipate is such a freeing experience. It also makes photography more exciting and it's why I primarily shoot film.