I have been a long time reader of SOS (having subscribed), and your point is very valid. However, I would note that there has been a lot of overlap between ‘Techniques’ and the ‘Music Theory’ elements. For example, Techniques in ‘orchestration’ might sit in either, but this won’t materially change the ratio or your point.
It’s also the case that new gizmos come out at an increasing frequency, whereas theory and writing practise is relatively static, so you would expect a difference, as in photography.
Know what you mean, and my music creation skills are about on a par with my photographic talents , but I do like improving my theory knowledge, often using my guitar (where my playing skills are even weaker).