This is going to sound VERY conceited (but I'm going to say it anyway) but I might be the person who started that trend a few years ago. If not the first I do have to say I came up with it on my very own. We still charge our "Conventional" LiPo like this as well. I've never had one "Go Off" in the cell so I can't say for sure how much it will stop or slow down the reaction but it gives me an extra level of "feel good" that I'm doing all I can to be safe.
I've had a conventional LiPo go WHITE HOT on me. I put some LiPo in the back floorboard of my wife's car as she picked me up from work a few years go (I had been charging packs all day for evening flights). I accidentally allowed exposed charge leads to touch together and they immediately welded together causing a total discharge issue. Luckily I "heard" it and jumped out, opened the door, grabbed the box they were in, and dumped it onto the asphalt. Fortunately the "inferno" only damaged one additional pack (and it did not cause that pack to ignite but did ruin it). The wild thing is the amount of HEAT that was produced in mere seconds. The pack swelled up MASSIVELY and the resulting white/blue flame (like a blow torch) literally melted asphalt. The whole episode went dead in about 15 seconds but the smoke (and it was NASTY smoke too) kept rolling for a couple of minutes until we put several shovels full of dirt on the pack.