I think once you find a tool you resonate with (be it EFT or anything else) use it. Sounds obvious but if something works for you, that’s all that matters.
Can you accept a theory if it has practical value for you? Practical value in that it enhances your life and brings you peace. You don’t necessarily need to know how it works.
I feel we humans have a habit of trying to dissect everything. We feel uncomforable if we don’t know the answer. See if you can apply EFT anyway.