Once again. How many German tanks developed in 1943 or after did NOT have great frontal armour and a gun that could knock out any of the majority of allied tanks from good ranges. None of that makes the hetzer special, indeed, it makes it average in armour, and slightly less than average in its gun, considering the germans were moving over to the long 75mm in the panther and jagdpanzer, and the long 88 for the KT, Jagdpanther, and Pak43. Its small size WAS a bonus, but that was offset by all the other factors you listed that made it extremely difficult to operate. All in all, it simply wasn't that great of a TD. Its one major plus was that it could be manufactured relatively quickly in comparison to other german tanks of the time.