So, after reading the Canadian accident report, it seems that the Concordia was quite vulnerable to knockdown, even with its reduced sailplan. It really is scary to learn that a "mere" 30-ish knots of wind would have been enough to endanger the ship, and that what hit it may not have even been a full-scale microburst. Had I been crew on the ship, unless I'd been told otherwise, I would never have thought it would be in danger from garden-variety squalls. It seems that a lot of 35-footers might have better stability.
Additionally, the owners had been negligent about updating contact info for the ship, contributing to delays in the search effort. And the ship was traveling near squalls with lots of vulnerable doors open. And they had the bad luck to have most of their comm gear on the side that went down.