I'm firmly in the shoes camp. I've stubbed to many toes and even on my beach cat, years ago, I prefered wet suit boots if the wind was up at all. Better grip. But iron sailor in past went barefoot in the rigging around the Horn (leather soles were more dangerous than cold toes--I bet they would have scooped up rubber-soled trainers in a heartbeat) and the debate continues in some circles.
I wonder if this has ever been systematically tested.
- I'd bet dinner that the correct sole will out grip skin on every surface. I doubt it even merits serious discussion.
- I've heard of studio dancing, but always with the caveat that the feet can't be sweaty. Boats get rain and seawater on them, so forget that.
- Surfing feels better with bare feet, but the reason is nerve endings. You can feel the board better. I've surfed with wet suit boots, and the traction was the same or better, but the feel was less. But I was also not cringing with fear every step, wondering if I was going to cream something. If you slide on a board you just fall, so toe protection, pain, and fear don't enter in. Also, the deck of a surfboard is optimized (soft wax) for bare feet. I doubt anyone spreads surf wax on the their side decks. Without a good coating of surf wax, a board is slicker than eel shit.
- I've heard you can "feel" more with bare feet. I sailed a beach cat for a decade, winter and summer, and I can honestly say I never felt bare feet were better. If there was serious wind, boots for 100% certain. Better traction. The only reason for bare feet was casual days of beach bumming or incinerator heat and light winds.
- I've known of a rock rock climbing problems that are done bare foot, but only because a toe needs to fit in a very specific hole. Weird stuff, climbers consider it very, very fringe. 99.999% of the time shoes are better.
- Deck shoes should be thin-soled for feel and so that they conform over and around ropes. Not the best for tennis or miles of walking, but that is what true performance deck shoes are. "Boat shoes," as distinct from deck shoes, never appealed to me. I'm not into style. Multi-court shoes and trainers can certainly work on decks, but the soles are thicker than optimum to allow padding for running and jumping. I don't run or jump on a boat, at least not the the point where additional padding is required. I do wear orthodics for flat feet. I have multiple pairs, some for higher impact sports, including hiking, and some thin for sailing, cycling, and skating/skiing.
- There is always the matter of skin cancer and covering up. Some are deniers. I admit to wearing multi-strap sandals on some of the hottest days ... with thick sunscreen.