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I understand that in multirole or strike aircraft the cannon has a CAS use, but on a purely fighter aircraft, does the benefit of a fallback weapon outweigh the handicap of added weight?

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I think this question is highly opinion-based and should be closed.

But here are my $0.02

Historically there were attempts to remove cannons but turns out too early: Missiles are not that good. The benefit of fallback weapon indeed outweight the weight.

MIG21 VS RF-4C

One instance of combat during Project Dark Gene was an engagement on November 28, 1973 between an RF-4C aircraft piloted by IIAF Major Shokouhnia and backseater USAF Colonel John Saunders and a Soviet MiG-21 flown by Captain Gennadii N. Eliseev. The Soviet pilot fired two Vympel K-13 missiles at the Iranian aircraft, failing to destroy it. He was ordered from ground control to press his attack at any cost, and with his cannon jammed after the first shot,[8] he continued by ramming into the Iranian aircraft and losing his life in the process. He struck the RF-4C's tail assembly with his wing and then flew into high ground. It was the first deliberate jet-to-jet ramming by a Soviet aircraft during an interception, a practice common in the propeller age of World War II. Eliseev was posthumously awarded as a Hero of the Soviet Union.[3][9] The crew of the RF-4C aircraft were captured by Soviet ground forces and released after 16 days.2[10]

US military reached the same conclusion around the same time as well, to add cannons to F-4 Phantom II.

Maybe now is the time to rethink this question again after 40+ years advancement of AA missiles. But if you ask the pilot, for the same weight, do they want fuel, gun+ammo, or nothing? A significant portion, if not the majority, would pick the gun I guess.

A lot of fighter pilots, or even astronauts, carry pistols. How useful is that?

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    $\begingroup$ It's not just the reliability of missiles that's a reason for guns, it's also their limited number. Once your precious 2-4 missiles (the normal warload of most aircraft) is exhausted, you're now useless except as a pair of eyes. The gun extends that to several more engagements. And do remember that it's normal practice to fire missiles in pairs to make avoiding the attack harder. $\endgroup$ – jwenting Jul 30 '18 at 9:03
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    $\begingroup$ If you seriously think it should be closed, you're saying it shouldn't be answered, and you say because POB which tends for VLQ answers from low-rep users . So why did you answer it at all? $\endgroup$ – Nij Jul 30 '18 at 10:16
  • $\begingroup$ @Nij For fun, obviously. $\endgroup$ – user3528438 Jul 30 '18 at 10:23

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