I call BS to that....we get 3 to 5 mph currents all the time in Palm Beach.....it's not like we don't know currents.....and one thing that is obvious, is that there are MAJOR differences between how divers on charter boats are able to go against currents, or crosswise to them if desired or required. Splits being the most ineffective.
If fit divers could not do a bad day with freedive fins, then normal divers could not do this on a normal day.....If you are talking 8 and 10 mph currents, then how in the he&& does a charter operator justify operating in it?
I have done lots of diving around Fiji, with freedive fins ( even left a pair for the DM when I left)....and they allowed me to do anything I wanted to, at any time, at any site.
This is a nonsense of the dive industry, thinking that all fins are equal, and that divers don't NEED to be able to have REAL Propulsion if conditions dictate it.....While fitness does play here....put a "fit diver" in splits, in a huge Palm Beach current, ask him to go sideways or up current, and he is a leaf in the wind...put freedive fins on the same fit diver...or for that matter, Extra Force Fins, and the fit diver will blast up current with no problem, or across current.
We see this all the time...fortunately in Palm Beach we have great drift boat operators, so that all these people with split fins are not going to ever need to fight a current--the boat will get them wherever they are taken to.