The Panther was significantly more complicated than the T-34 and the interlaced running wheels were a nightmare for both manufacture and maintenance. The relative number manufactured between T-34s and Panthers tells the tale. Just imagine the hell the world would have faced if the German could have built and crewed 22,000 of them!
I also think the Jagdpanzer concept was an excellent one - extending the life of obsolete chassis and turning them into AFVs well enough armored to survive a tank engagement and well armed enough to win.
As the old saying goes, imitation is the best form of flattery. The Soviets sure copied the Jagdpanzer concept.