---- Matt Cutts Answers How Much PageRank is lost through a 301 redirect
brotherhood_of_LAN - 1:16 pm on Feb 26, 2013 (gmt 0)
No doubt that's the prudent approach and help keeps fate in your own hands.
I guess the same could be said for unnecessary redirects, There shouldn't be 2,3,4+ redirects when 1 page could handle the rule set. I see it as more of a courtesy to the user rather than some PR preservation though.