The take on the use of reflector sights in combat aircraft is completely nonsensical. Those sights were not used the way one would use a shotgun. With a firearm you usually look at the target and bring out the weapon to the horizontal plane formed by your eyes, and it's like you're on a swivel as you can fire in any direction you can turn to. With an aircraft, you're inside a machine that can't turn on a dime and to aim the guns - you need to change the velocity vector. The kind of shooting one does with a bead on a shotgun isn't possible inside an aircraft. It's like the difference between skeet shooting off the back of a truck, or mounting the guns on the hood facing forward and having to steer the entire vehicle.
The use of "instinct" is complicated by the fact that you can be diving or climbing while you're shooting, which has an effect on whether gravity is subtracting or adding to the bullet velocity. The pilot deals with a relatively large volume in 3d space. There's a lot of factors playing tricks on "instinct" compared to shotgun shooting. Even then, use of tracers and explosive shells to "walk" a burst into the enemy was extremely common as it wasn't always possible to get the deflection right with the first rounds.
The funny thing is, before reflector sights became common aircraft did use bead sights (albeit with a ring rear right so it doesn't count).
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Either way, the main advantage of the reflector sights were the ease of compensating for deflection or distance by using the reticle and gyro system. By turning a dial the pilot could shrink or enlarge the reticle so that it could match a known aircraft's wingspan and this automatically gave the sight a lead computation. This makes reflector gunsights in WW2 clearly about increased accuracy and ease of use while chasing enemy fighters. Not faster snapshots.
TL;DR: Karl doesn't play flight sims and it shows. Also doesn't understand historical context.
