I was also an avid Wikipedian for quite a while. My area of contribution, however, was not physics, and of what I contribute here wouldn't have a place on Wikipedia in fact.
That actually brings me to an important point. Wikipedia and physics SE could duplicate a large amount of effort. Our equations are in almost the exact format needed for Wikipedia. This brings even more points to mind.
What license are contributions to Physics SE covered under? Would it be technically possible to copy work from here to Wikipedia articles? Would it then be admissible under Wikipedia policy?
My imagination is that the answer is certainly "no", although it's interesting to consider since presumably the questions here are asked precisely because they can't be found on Wikipedia or other online texts.
Of course, I've skirted the actual proposal which is about help, I think. I imagine the people at Wikipedia told you to take your questions about physics to the physics SE because generally, a discussion page on Wikipedia is devoted to discussion about an article or project, as opposed to the subject matter of the article. Similarly, the meta site here is for talking about the direction of the Physics SE site, not physics itself.
Honestly, a pet peeve of mine is that Wikipedia is too limited in focus. If I went to WP:RDS, what would I find as the current goals? The WP:OR policy in particular was frustrating to me. It's hard to get a match between what people want and what people are willing to provide on Wikipedia, and I think that SE answers that very well.
Anyway, I've rambled enough. It is an interesting thing to bring up.