Writing your notes in a bound notebook as un-OCR-able calligraphy, and then scanning the results to image files is not likely to endear you to me as a co-worker.
As such I'll mostly write personal notes for my own reference and make a judgement call about where I put in the 10x effort to communicate to co-workers.
Your approach seems to couple problem solving with communicating with co-workers. Sometimes that's an advantage - often not.
The handwritten bound notebook cannot be searched, diff'ed, or versioned. It is strictly inferior to the plaintext file in most ways that are in any way relevant to writing software.
Its nemesis, of course, is and has always been the mathematical equation, whose notations confound the plaintext writer at every turn. For those, you can write it to an image, or use LaTeX or MathML.
It is just as important to control process documents as it is to control source code files.
(But I do use paper some - focus reasons, and easier to manage than terrible phone interfaces.)