Here's a very nice answer to the question about determinism and QM (in 1st answer by Artem Kaznatcheev):
https://philosophy.s...ove-determinism
"Most serious researchers on the foundations of quantum mechanics, usually side-step this question by taking the operationalist point of view. Tagline: "all we have is some procedures for setting up an experiment and the results of experiments". In this framework, you can derive Bell's theorem, which says that any phenomena that is both deterministic and local must satisfy the Bell inequality. Quantum mechanics violates the Bell inequality (and there has been many experiments to mostly confirm this violation, there are some technical loopholes that need to be addressed in some of the experiments). This means that you must give up at least one: locality or determinism. Since without locality it becomes impossible to talk about causality, most people prefer not to give it up, and instead give up determinism."
Which one would you rather give up, causality or determinism or both?