Hurr Ivan wiped out every floating dock in Pensacola. They handled the surge, just didn’t have enough pilings to hold it all together with the leverage of all the boats cranking on them that high above the bottom. Plus, the docks themselves broke apart from the thrashing, and if tied to those… Lots of boats floated away still tied to a portion of its floating dock.
Every marina was wiped out also, except mine; an old fixed wooden dock, but we’re in a very protected cove. Fixed docks add structural support for the pilings. Some pulled up 5-7 feet, but they stayed put and so did the boat tied to it.
Floating docks are fine for normal tidal movements, but I wouldn’t want to tie to a flexible structure for a hurr. I’d rather tie up to something that isn’t going to move.