While winging might be possible in light winds with a very large wing & foil plus a large floaty board it's a marginal affair with lots of pumping when a lull hits or just floating along waiting for a gust.
In my experience with a low cost Flysurfer Peak or Hybrid kite of 6m to 8m, a 1000 to 1200 sq cm foil and a board of approx. 1m long & weighing 2-3kg will foil through lulls and stay on the foil in ridiculously light winds. Even if the wind drops to 3 knots these kites will stay airborne.
Best of all I can carry all my gear to the beach under one arm and rig in minutes with no pumping. Oh and if there is a shore break the kite will pull you through to deeper water much easier than swimming a wing and large board.
Also a kite can find the wind higher up especially in stratified locations and working the kite can be done for a lot longer than pumping a wing.
However note that I am referring to kites that weigh around 1kg or less. Using a standard construction LEI kite will limit your low wind ability. An Aluula kite will make light winds a lot easier but will cost a lot more.
Looking back however, prior to the use of the hydrofoil light wind was always measured in double figures of around 12-15 knots. Now we can have fun in 8-10 knots So much more time on the water now