I dont really see the OPs point. The pak 40 is tied for the best penetration on a non doc at gun. The stug sits at a perfect middle ground penetration wise between the cheaper su76 or m10 and the more expensive su85 and Jacksons. I dont see how you can criticize the Panthers excellent penetration. The panzer 4 is the only unit in ostheer roster that has penetration that is SLIGHTLY below average for cost, but it exchanges it for armor.
Yes thats why the panther also has one of the best mobility stats ingame...
3. The panther also gets amazing mobility on top of its high armor and hp... use it
The panther has fine mobility but it really isnt this speed demon you are making it out to be. Stock its slower than comet valentine cromwell and m10, and its speed and acceleration only marginally exceed that of most other allied mediums.
With vet most(non heavy) allied tanks end up substantially faster than the panther including the su85(!), with exception of the su76, the jackson, the firefly and the centaur.