This argument is flawed. It's a strawman because nobody is suggesting that feedback should only be "wildly positive". Positive reinforcement is very different

This argument is flawed. It's a strawman because nobody is suggesting that feedback should only be "wildly positive". Positive reinforcement is very different from being wildly positive. It's also a slippery slope fallacy because there is no evidence that there will be extremely aggressive reaction to constructive criticism. If you could provide evidence that managers who use positive reinforcement have underperforming teams this would be an interesting comment. I suspect that would be hard to find.