There's simply nothing wrong with discussing and challenging other people's viewpoints. This is a forum, this is what forums are for.
Challenging other people views is fine as long as it done in constructive way and not in "forum warrior" way.
Challenging other people and not their view is simply non constructive.
If you want to decrease TD effectivemess vs mediums actually the best answer would be to mirror them with the firefly. It's by far weakest TD vs mediums in the game but still counters a heavy tank with the correct micro and support in its sniper role.
Of course this would mean hefty DPS nerfs to the other TDs as I pointed out in the panther thread...
Nope the distance FF is not that big specially since it can delete a medium with one reload. And there reason why it feel to you that FF is up vs mediums is simply because other TDs are OP vs mediums.
If you are losing FF to PzIV you are probably doing something wrong.
Actually a Panther with the sight, accuracy, damage and vet bonuses of the FF would be OP vs mediums even it had that same reload and did not have Tulips. A vet 3 FF kills a medium with 2 reloads.
I can make a mode for to you to test.