There must be a couple multiwire options for their situation. Gfi and afci doesn't necessarily mean no multiwires anyway.Welcome to the forum.
Alternatives include using MWBCs, up-sizing to #10 and possibly larger conduit, or using two conduits.
I see the "as many as will fit" philosophy quite a bit. I assume it's a mix of not knowing and not caring about derating. Got a job currently with a 1" EMT to a 4/11 with two extension rings.....how do get 12 #12 on 6 20 amp circuit and its fine. the derating factor? pipe fill.....
im seeing this morw and more
