heavy eaters will return to places wherethere are no trays and small plates. They are not lazy. They are perfectly happy to go for seconds or thirds. etc.
As for small desert bowls, just use a soup bowl for your ice cream. That is how to get around that, if you just have to have a big helping.
As far as the specific item shown, roe on rice.. OK well any "all you can eat" thing like that is a risk because what the restaurant may do, is say "AYCE" and then load up that bowl to the top with rice and only a small, thin layer of roe.
You can see the rice through the thin layer of roe right in the picture..
and then what some people do, is they eat the roe or the fish meat fish off the rice, and leave the rice, and go back for more, because it is AYCE.
They waste the rice, and thwart the restaurant's scheme to load up the customer with rice instead of the better food like the roe or meat, and hold back to small portions of the better stuff. The restaurant does that obviously because rice is cheap.
If I am going to eat a bowl of stuff like that picture for lunch, I do not want it to be 95% rice. no matter how much I like rice, it has too many carbs.
There was a sushi place that had a sign on the wall "this is sushi, not sashimi. $3 charge for rice left on plate" -meaning the big chunk of it. Their sushi was good though, thick pieces of fish. What I hate is again the huge rice with a paper thin piece of raw fish on it, then calling it sushi.
There was an all you can eat fajita place that used to just about ram rice and beans down people's throats. Once they went in and paid, they were trapped by deceit. You'd get the fajitas, and they would come with the usual side dish of rice and beans and pico.. But when you went back for seconds etc., they would pile a mountain of rice and beans (but no pico and guac) on the plate - with the fajitas, and then subsequently refuse to re-up your fajitas unless you returned to the counter with a clean plate indicated you had eaten the enforced excessive rice and beans, whether you wanted them or not. I got nothing against rice and beans either, but hey, it is AYCE FAJITAS, not all you can eat rice and beans with a few little strips of fajia meat for appearance.
I do not defend the following, but what started happening was that people would feel cheated by this trickery and scrape the un-asked-for items off the plate onto the table under paper napkins, to the floor under the table, into a glass, etc. in an attempt to receive the proper amount of fajitas as promised in the advertising. AYCE fajitas =|= AYCE rice and beans.
Any time I go to an AYCE place, I arrive hungry but I know I am going to have at most 2 plates. I choose carefully, for the better vegetables and above all the best meat, and avoid bread, rice, refried beans, tortillas, and other fill-er-up foods as much as possible. You betcha I trim fat off the meat as well because that is not for me to eat but rather it is food waste that was not removed in the kitchen. Often the servers come around "pushing" hot buttered rolls, etc. Obviously - to fill up the customers on the low budget instead of having the customers fill up on their choice of meat. The same goes for anywhere from Golden Corral to Fogo de Chao, where they hate me because I patiently wait for the filet mignion and lamb to come around, avoiding the extremely tempting salad bar full of breads, cheeses, veggies, and other delights. I treat that as 'dessert' -if I have room. Sorry for obscene $40 I am there for the best meat only.