While I like Frog lube on my pistols, I have found that with ANY gun which sees high volume shooting, it holds onto the powder residue and it cakes up. My S&W 9504 can run junk ammo for days with it and no real cleaning, but it gets filthy dirty. With any light oil, there is much less carbon buildup.
In my AR, if I do a training course the rifle will go thru 600 or so rounds for the day. With Frog lube, it looks like I rolled it around in charcoal in the chamber, and the BCG has a lot of build up, even in the rings and the trigger assy gets pretty dirty.

Still functions; that is not a battle cry I can make. But it gets DIRTY; much dirtier than with Mobil1, Slip, CLP, RemOil, etc.

The green stuff makes a grumpy feeling 1911 smooth as silk..... so it DOES have it's place, to be fair.