Foils are starting to appear in production boats
Candela ships both ferries and leisure boats with foils (though propelled by electricity rather than sails).
https://candela.com/
They've been in use for decades.
https://en.wikipedia.org/wiki/Moth_(dinghy)
alt Hacker News
Candela ships both ferries and leisure boats with foils (though propelled by electricity rather than sails).
https://candela.com/