As a sp/sx 4w5, I havent cried in.....3 years, before that it was about ten years. I agree this likely is emotional repression, but it does lend itself to not being particularly whiny or a wuss.
Typically I have felt pretty alone, but have discovered several other 748 or 741 tritypes that are also 4w5 sp/sx where I work, all enfps, all older men. In general we piss people off, are bossy, are oblivious to subtlety and have all types of negative characteristics....we are loud, rude and argumentative and convinced we are right until proven wrong, at which point we are right again, which my entp finds hysterical funny.
We drive others around us to be better and feel the need to extrovert our own high standards upon the folks we work with, as we have a value investment in what we do-thus dont have time for them to screw it up. The funny part is due to the sp/sx, we have this weird inner fluffy child, so when we get together, we smile like little kids and sort of...rub our fuzzy cotton ball insides up against each other, then we proceed to argue like banshees over whatever problem we are solving, but we never really get mad, cause we know we are aligned on the value behind the problem.