Pretty sure they're usually talking about okw p4/vet 2 ost. Never seen someone complain about vanilla p4 armor, but this is also irrelevant to the thread
i saw people (not gonna name them here but u know them) saying the t 34 76 is less durable than other tank by a lot as it has 10-30 less armor than other medium
btw back on topic, the 50 more armor of the centaur will allow it to survive a medium tank much more easily as it will have the same armor as a Sherman (and before u say ostwind can outrun other tanks, it's slower than all other medium tanks)