GFIs gradually fail. We’ve observed this on our dock at Lake of the Ozarks.
I recall the Museum of Science in Boston had uncovered electrical receptacles about 10 inches off the floor in a carpeted lounge area, with sofas, where people with small children could relax while kids crawled around on the carpet. They had a sign posted claiming that covers were not necessary on the receptacles because they were Ground Fault Interrupter protected(!). Even assuming that the potential shock was only transient, what happens when a kid pokes a bobby pin or paper clip between power and neutral. But, hey, they are the Museum of Science.