What do you mean?

Quantum mechanics is indeed a different viewpoint

As I recall, the Feynman diagram approach assumes that every conceivable interaction between particles that could happen does happen with a given probability depending on the interaction's complexity.

Indeed, the Heisenberg Uncertainty Principle is quite a mind fuck - if you know the exact speed of a particle, the location of particle become utterly uncertain to the point that it could be anywhere in the universe.

So what specifically is your problem with the above quote?