I realize that people have reported seeing a sign warning that passengers might get wet. I, personally, did not notice the sign. I have been on the Dis since long before FEA opened, and I never noticed a post saying that I could get soaked on this ride before I got on it in March.
Many other posters have reported seeing such signage. A guest or guests not noticing a sign isn't reasonable cause for complaint.
Someone above said a restaurant wouldn't kick you out for being a little wet. Perhaps not, but if I had gone from this ride directly to a restaurant, I would have gotten the seat wet when I sat down. The next guest at that table might not have appreciated that!
The wet guest would or should considerately advise restaurant staff that they're wet. Then there are options for the restaurant, and the next diner in that seat. Why would someone not?