Ok so then let's keep the Flame Hetzer dead just because it's somehow unbeatable on "urban" maps. Which maps qualify as urban by the way? Oh wait there are no "urban" maps in 1v1 and 2v2. You could argue Lierneux is somewhat urban but everyone has it in the veto list anyway.
Also I don't see how a Hetzer could be so OP in an urban setting when it's so vulnerable to getting flanked, snared and killed by a single ATG.
Well, Sander is right about Hetzer's role, additionally it's one of very few dedicated AI vehicles in OKW roster that survives the chaos of 2v2 and 3v3 mid-lategame, doctrinal Ostwind is the other one, but it has significantly less survivability and urban themed maps (or maps with bunch of cover) favor Hetzer. It's also pretty cheap and a part of well-themed doctrine. Think of it as AI supplement and not replacement for P4.