It's 2014 and WSE at this point has more efficient performance, so even low-spec computers won't lose out. There's WSE 3.2.0 out now for crying out loud:
http://forums.taleworlds.com/index.php?topic=151194.0When are we going to just buckle down and make the transition already? Even without the possibility of awesome new additions from WSE, we're missing out on some cool built-in Warband mechanics as well.