Is there any point in using both rifle and pistol?

I'm currenlty playing a sneaky sniper. I'm level 27 and have been experimenting around what kind of weapon loadout I should use.

Currently my "main" weapon is a sniper rifle (of some sort) for long distance and a rifle for medium to close encounters. For RP-value I've also used pistols, primarily when fighting indoors. So basically, I have three types of weapons: sniper, assault rifle and a pistol. RP aside, it just seems rather redundant to have a pistol even for very close battles when my current rifle (All American) seems doing the job just fine for those moments when a sniper rifle isn't really viable.

So basically: Is there really any point in having both a pistol and a rifle for closer fighting?