S76 Undercarriages.
I'm not comparing it with skids. In about 1983 a S76 in an operation I was with keeled over on a helideck because the undercarriage mounting had broken away from the fuselarge structure. Most large hellicopters I have flown can take much more punishmment than a 76 and the 332L has a navy undercarriage that can take a 900ft/min hit. Irrespective of that to dip the gear into the water with more than minimal airspeed on is going to put enormous stresses on the legs because they are expecting the wheels to go around.