I don't know the answer. I only started diving in SE FL in 2009 and now have a few over 1,300 dives in Boynton, Palm Beach, and Jupiter.
All of the operators I have ever used in Jupiter and Palm Beach have always put a guide in the water who you could follow or not. Underwater Explorers put a guide in the water out of Boynton from at least 2009 until a few years later, when that was discontinued. None of the other operators I have used in Boynton have ever put a guide in the water. As above, all groups and solo divers carry a flag.
Just like in Jupiter and Palm Beach, the current in Boynton is usually north, but can be south, and varies between nothing and absolutely ripping. The outside reef in Boynton is nearly as deep as the inside in Jupiter but is a bit harder to dive, particularly in current, due to the spur and groove (fingers and channels) rather than reef wall. The inside at Boynton is generally shallow, 50-60 ft.
I wish I knew the answer to this question, maybe someone else does.