A 15 degree list indicates significant flooding and loss of buoyancy. Coupled with strong winds and large waves from a slow moving hurricane capsize and catastrophic hull failure are strong possibilities. In storm seas the last thing you want to be is top-heavy and listing.
Not a sailor, but I remember my Navy brother saying they got excited with rolls over 17 degrees, Don’t remember the panic level figure , but his ship wasn’t as top heavy as a loaded container ship.