Whats the real justification behind the conventional wisdom that wetsuits are necessary for open water swimming in cooler temperatures, and is it truly worth the added expense and buoyancy for the average swimmer, or is it just a marketing ploy to sell more gear? Everyone seems to blindly accept that wetsuits are the only way to go, but what actual scientific evidence supports this claim, and are there any credible sources that suggest otherwise? Is the added buoyancy really worth the potential restriction in movement, and are there any notable swimmers who have successfully competed without wetsuits in cooler temperatures? It seems like every open water swim event and triathlon has become a wetsuit-clad affair, but is this really the most effective or efficient way to swim, or is it just a matter of conformity to the status quo?