>>>> And yet, isn't one of the premiere goals of science, at least of the sort aiming at ontology, i.e. physics, to formulate a "Theory of Everything"? In other words, one idea to rule them all?

Perhaps a more humble way to describe the pursuit of "theory of everything" is simply to uncover and reconcile contradictions and compromises between the theories that we've already got. The one that comes to mind is between quantum mechanics and gravity. So far as I understand what's going on, the term "theory of everything" is limited to that specific context.