Questions to Drop
I'm not at all convinced of these answers. (1) The real-life vs. administering Wikipedia distinction is artificial, and dangerous to make. (2) There are plenty of admins who need to remain anonymous because they have had various sorts of threats made against them, and the normal threats to anyone's livelihood and vitality from poor health are no less real-life at all. If you don't treat administrators like real-life people, I predict the survey will seem much worse than trying to get at the reasons why admins stop editing. (3) The conclusion that the answers to two questions about exercise will not be enough to draw any useful conclusions is placing the cart before the horse. The fact that photos of meet-ups exist to form a separate sample set against which to compare such answers was not addressed. Answer (4) suggests that former work should not be improved on, which is not the wiki way.
A separate health issues survey would seem very invasive to me. I am at a loss for further words. Best wishes.
I think you're not convinced by the answers partly because you didn't understand them. My fault for not being more clear. (1) When I said exercise is covered by the "real life issues" answer, what I meant is that one of the responses is "real life issues." Needing more exercise is a real life issue, therefore, someone who decided to leave because they needed more exercise will select that answer. Therefore, exercise issues are accounted for with another answer option (real life issues). (2) It would require a lot of questions to outline all the different real-life issues that would cause administrators to leave. Too many for this survey. (3) We can agree to disagree. (4) If you want to compare two samples, you have to ask the same questions to both of them. We can add more questions, or change questions, but added/changed questions can't be easily used for direct comparison of samples.
I agree that a separate health issues survey would be invasive and don't support building one at this time.