For me, theres no "pros" in this. Mao lang ni hinungdan sa away plus manganad ang babae na she can stick her nose at anything she wants to know.
Not sharing your passworsd(s) to your wife/gf doesnt autumatically mean that naa kay gi tago or nag binuang ka they are my personal space and no one can access it except me. Even my ex's, wala nka hilabot sa akong cell phone nor my FB. I just wont budge. In return, dili pud ko maki-alam sa iyang "personal space" para fair.
All though a relaionship is a two-way street, men should be the one na mo dala and not depend on your partner. Thats the reason why we are "MEN".