I've been using a Bullet Journal setup for about 3 years, though I do use Things 3 a bit as well. I'll be trying out dropping Things from my system and going only with the notebook.
My biggest hurdle with that has always been "template" projects like uploading a video. I have items that I must do, and I must track any cards that need to get added to a video, or links need to be added. If I use only a notebook I'll have to write out the video project checklist every time I want to produce a new video.