I agree that when sukiyaki is done in a non-restaurant environment, it is to a certain extent communal. My good buddy Rick, who is of Japanese descent, uses his mom's 50-year old GE electric skillet that his family used when he was growing up in the Japanese neighborhood near Broadway & Diversey. Most if not all supplies & foodstuffs for authentic sukiyaki can be gotten at Sea Ranch near Edens Plaza in Wilmette, and we have been fortunate enough on more than one occasion to have him bring the goods to our house & do his thang. Each diner has a rice bowl and then a second bowl of the same size for multiple small helpings as ingredients are continuously replenished & cooked in the skillet. BTW, very thinly-sliced (when still slightly frozen) marbled ribeye is the ticket for the best beef to use. I've never tasted better sukiyaki than this, and I've had a bunch of different versions.
I must say, though, that Renga-Tei in Lincolnwood comes close in its rendition. Yes, it's in one bowl. But it's just 'right' in the mix of its semi-firm tofu that soaks up the broth, the half-moon of codfish, the clear shirataki noodles, the enoki mushrooms & bitter, crunchy greens. And...according to Rick...NO CARROTS! Anathema to sukiyaki...