I see! Yeah, the yarn can definitely get tangled but if I pay attention when I'm doing socks, it's really minimal. Knitting all pieces at the same time or each alone, 3 needle bind offs will get rid of shoulder seaming. I've got to try the pick up and knit set-in sleeves still. Eliminating that seam sounds heavenly. I expect it could be done on this pattern if one knows how and is brave enough to try it.
I'd prefer knitting one sock on a circ as I think you do but I get mixed up on what to do on which one, when every time I try it. SSS keeps me from just doing one at a time.
I should never overestimate my basic arithmetic skills.