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swoosh said..
There is a myth out there that larger low aspect wings mean smaller sail sizes which is false. You can just as easily run an efficient high aspect wings with small freeride/wave sails. The higher aspect wings just also accommodate a lot of sailors who want to sail more "freerace/slalom" style where they prefer to be more powered or are used to a particular sail style.
Technically, you're correct, but this kind of misses the point. Foiling gives the option to either use a relatively small sail with an upright stance, which is great for playing with waves and chop, or to use a larger sail with a more hiked out stance, great for more speed. With a small sail, it's pretty easy to have hour-long sessions without ever using the harness. Using a larger sail in the same conditions has me use the harness all the time, and I also switch from my waist to a seat harness, otherwise my back will start complaining after an hour. Basically, the larger sail means more effort.
The same is true for a smaller high aspect foil: to get onto the foil, you'll need more board speed, and unless you've got very good technique, a bit more muscle and effort. With a Starboard 800 front wing, I have to pump until I reach 13 knots board speed before the foil is stable. With a large Slingshot wing (i84 or i99) in the same conditions, I just step on the back to pop the board out, and sheet in. Very different.
So if you're willing to spend a bit more effort, a smaller, high aspect foil and a larger sail go quite well together. If you just want easy fun, a larger, lower aspect foil and smaller sail are a great combo. But that does not mean it has to be this way. I've sailed the faster 800 front wing with a 5.6 freestyle sail, and the Slingshot i84 with an 8.5 cambered sail, and had plenty of fun both times. As your technique improves, the differences also mean less - if you're foiling through all your jibes, never crash, and use the harness 100%, then a large sail and small foil are easy. But if you have to pump a lot after bad jibes, and have to uphaul a large cambered sail after crashes, the "small sail - large wing" combo is a lot easier.