The best ones are able to lean left-right and especially fore-aft.
We all know what the “center of gravity” (CG) is, but with something like a humanoid, we really need to have control over the Zero Moment Point (ZMP). ZMP is like CG, but when you take into consideration accelerations. When motionless ZMP=CG. Something as tall as a humanoid with such a small base under it and then carrying a load is going to have to either move like a snail or be able to lean into movements to keep the predicted ZMP under its base
I see that most of them do this and have a pivot either at the base or at the waist. A few have both. I agree that “Eno” is good.
I think most of these robots were never intended to go into production, as they were research tools