So a Sail Rite sewing machine will not sew all sails?
I replaced the luff tape on an old sail and had problems with missed stitches, but the problem turned out to be a wrong sized needle, so it wasn't the machine. But on a 43' luff, I changed bobbins quite a few times. I don't have a setup like Chef, so maneuvering a large, heavy sail is difficult.
Regarding a new sail, that's more complicated. On a smaller, lighter sail I might consider it. But to be honest, a sail is an airfoil and there is more to making one than simply stitching it. Not too many years ago, I would have argued that point, but after buying two new sails in as many years and watching the mainsail being built in person, I've modified my opinion. So I'd make a new sail but only for a smaller boat, perhaps up to 25'.
But for cushions and canvas work, the machine can't be beat. I've saved thousands. I've also made totes, bags, and duffels