There are good reasons not to consider particles ontologically basic. For instance, particle number is not relativistically invariant in quantum field theory. What looks like a vacuum to an inertial observer will not look like a vacuum to an accelerating observer (see here). If the existence of particles depends on something as trivial as an observer’s state of motion, it is hard to maintain that they are the basic constituents of the universe.
There are good reasons not to consider particles ontologically basic. For instance, particle number is not relativistically invariant in quantum field theory. What looks like a vacuum to an inertial observer will not look like a vacuum to an accelerating observer (see here). If the existence of particles depends on something as trivial as an observer’s state of motion, it is hard to maintain that they are the basic constituents of the universe.
Thanks! Did not know that.