How is being nuanced and coming down to specifics working for Bernie? Obama run on "hope and change", Hillary message boils down to vagina 2016. Politicians start to dig their own graves when they go down to subtance because there's more to pick apart/disagree with them. They cater to 80% that doesn't give shit about politics not 20% like you or me who actually follow it. Trump knows the game and is a good player.
Bernie's not being nuanced or giving specifics though.
You can tell Hillary is serious about policy, but has made the perhaps questionable decision to not get into it as much as possible. She's a wonk, but is trying to hide it and be the folksy endearing person she really isn't. Wonks don't necessarily make the best President, but it's better than the alternative of no policy knowledge or understanding.