I think part of what makes it so hard to come up with Prequal resculpts, at least from ROTS, is the figures weren't too bad to begin with (generally). Some of them did need an update though, like Tarrful for sure, but it's tough for me to look at some of those ROTS figures and feel like I'd be that interested in a new one.
Utapau Warrior/Security could be better (if anyone cared). Or maybe it was those little force unleashed guys that drove home how under articulated he is.
Or maybe the Prequals just truly are that devoid of interesting background people?
Or that there's gobs of background people...and most of them aren't interesting. Outlander Nightclub is no Creature Cantina! Senate hall is no Jabba's Palace!
At current price points, I'm also more inclined to buy Original Trilogy bit players, too.