The daggerboard/case thing is an odd example of risks people accept.  They do take up less space than a centerboard like on a dragonfly trimaran. 

  But that centerboard can kick up and be reset.  What happens to the daggerboard if you hit a sand bar, a whale, or a partially-submerged shipping container?

  If it's a good hit, the best case is that you had a crash case for the daggerboard, which is now lodged solidly in the case, probably immovable, but at least the boat is floating.  If the board breaks out of the crash case, or there was no case, now you're taking on water.

  Knowing that at some point almost all of us are going to hit something we don't mean to hit, I have a hard time with daggerboards for anything offshore.

Odd indeed..  On a boat capable of high speeds, the crash case may not be the best option.  Anyone not strapped in is going to be propelled forwards until they hit something.    A kick up solution, using a high aspect ratio daggerboard is simpler, lighter and cheaper.  The tricky bits are 1) a spacer in the bottom of the extended case to keep the water from causing drag.  But this is small beer compared to the work that goes into making a bombproof rear edge on a daggerboard case and 2) protecting the prop/saildrive from whatever caused the daggerboard to kick up.  A small, strong, angled  skeg is required, but heaven forbid that anyone would put one of these on a performance boat.  Not because of the negligible speed loss, but because of the 'look'.