I've never heard this "Most pilots" bit.
I've heard it in rare instances with some later birds like 190Ds. I've heard it was factory-modified to remove all cowl MGs on the 190G series of aircraft (they weren't dogfighting as much).
However such a small weight savings wouldn't help the AH flight model much, and those "peashooters" as ya call 'em are very effective for figuring out approximate lead on a target before you hit the secondary.
Not to mention in the A8 they're almost as strong as 50cals.
I took down a lancaster with just an A-5s 7mm guns once. Use a LOT of ammo but did it.