No hardware for it on new boats.
Mainsail shape is ruined when reefed as the luff curve dont match the mast.
If racing and the windspeed changes, you loose if reefed.
As the boats today are mostly racing oriented. They are simply not ready.
Now back to the brit foiler?
This.
Upwind isn't the problem. Diamonds maxed, downhaul maxed, rotation back, sheeted hard and drop a couple of inches of traveler and you're there. You're spilling so much air, and the sail is so flat that unless you had a way to properly make use of your downhaul, you'd probably be making more unwanted power than if you made use of what you've already got. Floppy masts and squaretop mains have an amazing amount of control.
Downwind though, better bring the beef.
and yes, back to the Limey Flyer.
