If particles are “just” particles, how would you solve the problem of two objects without spatial extent (point masses) being infinitely unlikely to ever collide? Among other things. In treatments I’ve seen, this is always explained in terms of particles “actually” being fields.
They are not classical particles, the uncertainty principle, for example, still spreads out the location. I don't really know how particle interactions work exactly, but I am pretty sure it is not perfect point particles having to hit each other exactly. I guess there is something like a interaction probability depending on the distance between the particles. I include a bit from an older comment I once made here with links to a lecture where this issue is pretty clearly addressed.
Here is Nima Arkani-Hamed giving the Salam lectures 2012, a five day series on the state of fundamental physics. I marked [1] about 30 seconds where he is very clear about this. You can also start here [2] and watch about 10 minutes of this lecture where he quickly redevelops the ideas of quantum field theory.
