The Dragoon operation of August 1944 ultimately did not tie down the German forces in southern France as originally intended because D-Day in northern France started in June. Ultimately though, it did provide a side benefit of opening up the French Mediterranean ports and supply lines up the Rhone for Allied forces in France.
However, could the shipping and forces employed for Dragoon have been more usefully employed in an amphibious invasion of Antwerp and the Scheldt (and maybe Ostend too)? Not having use of Antwerp port is often described as the major logistical bottleneck preventing the Western Allies from crossing the Rhine in 1944. Even after the city was cleared, the port was not usable for a long time because German troops and artillery still held out on the islands of the Scheldt. Could an August (or July) Allied invasion of Antwerp, the Scheldt and maybe Ostend storm these ports, capture them intact and put them into full use by fall of 1944? Or would such an attempt be too much risk to the invaders for too little potential gain in terms of time gained using the port?
I have heard the southern French ports were important for supplying the Western Allies in France. Perhaps without Dragoon the Germans could have holed up in them into the end of the war like they did in Brittany's ports. But were those southern French ports crucial for operations in the summer and fall of 44, or only from the winter onward into 1945? If you can make a "trade" and get earlier use of Antwerp, it seems worth it.