Robert henderson says it's not necessary to get into quantum field theory when thinking about quan theories foundational questions that non relativistic quanto mechanics is sufficient. If you take the idea that non relevistic quan mechanics has a lot less sort of mathematical baggage that it carries around with it, then you can focus in on the foundational questions better by thinking about that context than you would in quantumfield theory. But those are separate theories that won't be normally think of as like the measurement problem or the ontology problems of quantum theory in general.