They say the narrow flavor profile lacks the acidity and the other full spectrum of flavors that come in a normal brew. And I think the experts just view cold brew as an inferior way of brewing. I generally do not like cold brew as it does taste flat, dull, and stale to me.
“When you brew with cold water you tend to get a more generic, coffee-like set of flavors out of the coffee. Brewing with cold water makes it harder to tell by taste where a coffee might have been grown.”