Here are some of the issues (and btw I am on the applicant's side)
3. Though we are (hopefully) advocates for our patients and psychiatric issues vis-a-vis public health, psychiatrists don't like their colleagues having disorders they treat (or in the case of addiction, attempt to and repeatedly fail to treat) even though MANY of them do. And regarding family members, given strong genetic diatheses, well, res ipsa loquitur... It would be great if all PDs/academicians involved in education were as sensible and forward thinking as
@psychattending, but this is not the case.
4. As an applicant, one is trying to make an appeal to the program that he or she is worthy of being ranked in a competitive position. Yes, for most decent candidates, matching is not an issue, but psychiatry IS becoming more top heavy, and the better programs (not just the top 3-4) are becoming more competitive. Hence it makes sense to do everything possible to paint yourself in the best light, which means doing well on Step 1, going to a good medical school, and performing well in medical school. Everything else is far less important (multiple PDs on this board have said as much). Disclosing *might* make you memorable (though probably won't because lots of people do it), but you are leaving yourself at the mercy of the opinion/bias/view of who interviews you.
5. While what drives you may be personally important to you, what your program (and co residents) care about is that you work hard, show and do your job, can work well with others, don't dry to deflect responsibility/miss days for BS reasons, etc.