You need to add a copy of "Sheet Metal Shop Practice", by Leo Meyer,
ATP publications, to your "vast archives".
It has a whole section on how to use and adjust a bar folder.
It says, just like Ernie does, that a bar folder maxes out at 22 ga
sheet. But with 22 ga, you can adjust the wing, or folding bar, up or
down to make a sharper or more rounded bend. Most shops in the old days
had a brake and a bar folder, and mostly used the bar folder for things
like cleats, where you WANT a rounded edge.
You would use the brake for sharper corners, or, if you wanted really
radiused corners, you use a special die on a finger brake.