This may have been mentioned before, but continuity-wise it's baffling that there were THREE types of battle droids (of which presumably thousands were built) around at the time of the Naboo blockade and Clone Wars, but none have ever been seen since. Did they all self-destruct at the end of the war?

I'd have preferred that an existing design, like IG-88 or this guy had been reverse-engineered for the prequels - in the case of the CZ droid I'm not even sure we see a working model in the OT, so it might have been cool to see them in their heyday as part of a formidable army (they sure look scary enough!)