The sparks which fly when quantum theory collides with Relativity ignite conceptual brushfires of particular interest... problems about causation, ti… - Tim Maudlin

A physical theory should clearly and forthrightly address two... questions: what there is, and what it does. The answer to the first... the ontology... to the second... its dynamics. The ontology should have a sharp mathematical description, and the dynamics... implemented by precise equations describing how the ontology... evolve[s]. ...All three of the theories we will examine meet these demands.

Unlike space-time theory, where there is substantial agreement about how to understand the best physics we have (General Relativity), quantum theory has always been a battleground of contention. Nothing one can say would command the assent of most physicists and philosophers.

If one resolves the measurement problem by postulating additional variables beside the wave function, it is the dynamics of these variables which manifests the non-locality and which resists a fully Relativistic formulation.