Not a BG purist, myself. I chop with 3 finger chords on the lower strings, G-A. I’ve been in group lessons taught by pros who support the percussive...
Why not just choose a path that works best for you? Starting point is standard fingering, then adjusting to find your best path. Be sure to critique...
I'm a husband, father and grandfather. Trombone player in my younger days, dabbled with guitar in my 20's. Performed for 10 years with an a capella group specializing in anything not barbershop (LOL). Became enamored with mandolin a few years ago and am now spending as much time and effort as possible learning to play.