I cannot recall when the Moly fad began . . .
but, since then (20 +years??), I have shot about 99.9% Moly-coated bullets: I guess it could be argued - as I've stated before - that Moly has caused me to loose and to win!
I have yet to see Moly damage barrel performance (precision/life/etc.), and see almost no, "down-side" to it's use: it may rub off onto my fingers while handling the coated bullets.
Last summer, I used Moly-coated ("That'll never work") 25 Cal. BT bullets and a 1:9" twist ("That'll never work") Bartlein barrel - one of the THE BEST barrels I've owned - to win the 200Yd. and Grand Aggs. at the NBRSA Hunter Nationals - does overcoming the "double whammy" make me a GOD?
I don't think so . . . . but, it CAN be said that it didn't impair the rig's performance.
Testing Moly vs. bare bullets via a couple of, "bullet wrecker" (1:8") 6mm barrels GREATLY reduced, bullet failures: from 85-90% failure rate, to 10% failure failure rate: strong empirical evidence of reduced friction.
Since that experience, if only for the "cheap insurance", even via a bullet friendly barrel, I will not shoot a long/heavy (high BC) bare bullet through the "faster" twisted barrels. But, this is not an issue for the bullets/twist combinations used for, "point-blank" BR.
The argument appears to boil-down to individual empirical experiences . . . to paraphrase Frank, "ya either love, or, hate the stuff."
RG
P.S. I do not & will not coat bullets for others.