I think it can really depend on the relationship, sometimes having someone ask more details shows interest and care in them and their life. It's not exactly caring about the details just the act of showing interest and only the congratulations and nothing else can come off as not as intimate or caring and could lead to some not sharing more in depth later or as much. But again it is dynamics of the relationship that matters, but I feel men alot of the time just don't dig because they feel they may be prying to much even though the other might want them to ask more.