I disagree.
Waiting for heavies is not a strategy that punishes enough at this moment.
(Talking about teamgames, which are just as important as 1v1 games)
Waiting for a tiger isn't that dangerous, so why go for a PIV? Why go for a panther?
On the second thing your said;
If the tiger is as effective as going heavy t3t/t4, why would you go tiger?
No, it has to have something special, something positive about waiting for the call in.
I can just say! Ia agree, I play 4v4 mostly and all are waiting for super tanks expcept USF.