MUS points out the big failing of sea anchors for many boats be they have balanced spades (modern sail and power) or stern hung. That’s when the boat goes backwards the rudder or its fittings break. With warps or drogues the boat continues to move forward (abet slowly). Loading is gradual and no were as severe as with a bow deployed sea anchor. Although there are reports of windvanes being damaged by jsd to my knowledge not rudders. Hence the current use of jsd or the like in the power passagemaking crowd. This group used to use sea anchors given the strength of their bows and large panes of glass as the entrance to down below. Design has shifted and even old Norhavn or kady krogans are set to survive a pooping without down flooding. Take a look at the blog about passagemaking in the artnautica 58. Although a powerboat they carry no sea anchor but rather a drogue. Think about it. Whether power or sail being held stationary and being struck by the waves means more forces on the boat.