Well, it depends on what you plan to couple it with. This paper
or this article
describe some benefits. These are just good-practice protection measures and I am using them just to be sure, since I cannot be sure I know every equipment that will be connected to my circuits. A malfunctioning tube amp could easily send more voltage than your capacitor can cope with, but, more easily, an op amp can go bad from short voltage spikes like described in the paper above.
Of course, you can leave out all diodes and resistors and the circuit will work just the same. Until it doesn't