I think people struggle to see obvious faults in players when they play small roles or short stints.
Like, Fantenberg, there was a legitimate sentiment that this was a decent #6D. He was in the KHL a month after his final game. It shouldn't have been surprising anyways considering he was absurdly overmatched at an NHL level.
Juulsen is nowhere close to an NHL caliber depth defender.
He shouldn't be one of the top 10 D in any organization. To be fair, he isn't even one in this organization. He's somewhere been 12-15th.