Because I wouldn't shoot the %$@&** thing untill I was ready to surface.
Hi Kharon,
First, PLEASE sample the drift diving in Palm Beach/Jupiter. I believe it is some of the best diving in the U.S./Caribbean, and better in many respects than the Keys, especially with regard to seeing big animals (sharks, goliath grouper, turtles, pretty much year round). If you say no just because of a flag, you are missing out on something really special.
That being said, there are ways to avoid dragging it around.
First, most dive ops in the Palm Beach/Jupiter put dive master in the water, and that person carries a flag. You should stay in the "vicinity" but that is a loose term. You can get ahead of the group, off to the side, stay behind, and virtually dive solo, without dragging the flag. If you get ahead, you can wait till you see the group catching up, or if behind, kick a little till you see them. Vis is usually better than 60' and you don't have to be "on top of" the group by any means and still surface close enough to the flag. I have surfaced plenty of times probably "too far" from the flag, but deploy my DSMB at the safety stop so the boat can spot me. I have the blessing of being well known to the operators I use and I don't get any flack.
By, the way, the drifts will be set up over the best parts of the reef, so you are not being 'herded" to some sort of inferior spot by going where the group goes, and have no real advantage, in terms of seeing stuff, by being solo.
On wreck dives, no one carries a flag, so that is another option--get a trip out to a wreck.
Or, you can dive with a couple of buddies in a self-contained group, and persuade one of them to carry the flag. That usually works, for at least a couple of dives . . . .
If you want to solo, you will have to drag it. Lots of times, the dive master has surfaced with the group while I have plenty of gas left, and they hand off the flag to me to finish up on my own (they surface following the line so they come up by the flag). I live with it, and have had some amazing animal encounters this way.
It is not really an entanglement hazard, as you are floating above a reef and there is nothing for it to catch on.
Believe me, there are very, very good reasons for flags here. It's mostly drift diving; currents rip, groups get separated, it can be hard for a boat to spot divers in a chop or if rain blows in. Worst, there are hundreds of boaters and while most are idiots, even many of those know what a dive flag is, while almost none know what an SMB is and would just run it down.
As for LBTS, it is a lovely shallow reef out beyond the pier, with lots of colorful hard corals and soft corals, lots of tropical fish and good macro life, and the chance of seeing a school of tarpon as a bonus. Vis can go from 20 to 50 feet, but it is worse when it has been rough. Need a couple of calm days before the dive to make it work.
And, there, the flag is ESSENTIAL. The dive is shallow (10-18 feet), within range of big boat props, and the area has heavy boat traffic. My strategy, carry the flag from the shore to the edge of the reef and plant it in the sand. Enjoy the reef and, when time to return, carry it back. This way it does not interfere in the best part of the dive, and you only carry it "in transit". I often do the "in transit" as a surface swim, because I want to spend the most time on the reef. A flag is especially important for that.