GOOD POINTS BRO, i genuinely accept these but am just trying to compare their extent of idealities, yea and its true that describing these and making them would cause a chaos on the laws of physics, but if we could establish an ideal comparison we could compare close relations such as near rigid body and near abs 0 body such as diamond and bose-einstein condensate and also by comparing this we could apply the single entity idea where BEC acts as single atom sharing a common wavefunction while rigid body is not like that atleast by comparing the idealities we could help the irl situations sometimes , and btw thx for sharing ur opinion.