Well no, the deciding factor of that game was tech choices and getting greedy on the Panther kill. As I said before, playing conservatively will prevent this sort of thing.
Three M4C Shermans isn't a very balanced force. Certainly sounds like the sort of composition that a Panther eats for breakfast, and depending on positioning (Front armour? Rear? Range etc.), penetration (Only ~40% chance to penetrate panther up close.), supporting units etc it's still a risky fight even with the overwhelming tank force. Maybe if you had a more well rounded arsenal with say, some tank destroyers and infantry based AT, it might have gone a bit better.
A t70 can kill a stug on a good day too, I'm sure the shermans had it in the bag.
But hey, I'm sure it was strictly the RNG's fault.
You absolutely have 0 clue about how RNG can change games.
It's also not a question about risk or greediness, it's about how a certain thing (RNG) is out of your hands and can seriously decide outcomes.
If a tank gets abandoned, it's not always the fault of the player.
But why am I ever trying to reason with someone you can not reason with?