I've played jazz for about 45 years, and admittedly I'm not steeped in theory. I do know a massive number of tunes.
The people I've known who have made practical use of theory, mainly used it to help them streamline composition and arrangement. This I appreciate because I enjoy playing original material. Of course theory isn't telling them what to write, but perhaps it helps them come up with more coherent ideas more quickly.
The people I've known who have made practical use of theory, mainly used it to help them streamline composition and arrangement. This I appreciate because I enjoy playing original material. Of course theory isn't telling them what to write, but perhaps it helps them come up with more coherent ideas more quickly.