Weather sealing is not intended to protect the camera from being submerged, nor is it intended to protect it from water under high pressure. Liberally zooming or manually focusing while your camera is wet could also potentially compromise weather sealing, depending on how harsh the conditions are.
Note that there are two types of weather sealing for lenses: WR, which is your basic moisture protection, and AW, which also protects against dust. AW lenses tend to be premium lenses with better build qualities, and are likely to better withstand water as well.
My advice is that as long as you're careful and do your due diligence, you should be fine. If you're going on a kayaking trip, get a waterproof bag (even a ziploc would work) to store the camera in if you ever feel there's a chance you might fall in the water. And definitely wear that neck strap at all other times, drying the camera off with a cloth/your shirt if it gets hit by a splash
Adam
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