Is it as odd ... as the idea that centaurs exist? Or dragons? or 600 year old humanoids who don't sleep and can see in the dark? or creatures that are literally descended from devils, genies, and angels?
All that's cool, but centaurs climbing or being competent on a boat is preposterous.
Besides the silly believability line we're drawing here, assuming a world where centaurs exist, they are an intelligent species, with opposable thumbs. We can't contemplate that they might, at some point, have figured out solutions to problems of verticality?