I'm not claiming they are wrong, but the video is mediocre as a "mythbuster" as most guns will fire 10 rounds just fine coming out dripping water, why would they expect dripping with oil to be any different? Firing 200 rounds or so without issues would be better
Where is the exposure to dust, sand, etc.? I find excess lube and lots of shooting can lead to a black gritty "mud" inside the gun that sometimes causes failures -- 200 rounds per gun per session is pretty typical for me. I usually don't take them apart until I've had an issue, generally just a wipe down, swab of Hoppes with a pass or two of a bore snake and a few drops of Break-Free CLP on the moving bits.
I regularly oil my 45 ACP rounds shooting Bullseye Pistol. I will put a drop on the third and the fifth in the stack, and if I am feeling froggy, add more through the port holes in the magazine. I will use a 2 oz bottle in 180 rounds. I can see oil vapor puffing out, probably through the muzzle, but some is pushed back through the action. The action is kept amazingly wet. Oil comes back out of the chamber onto the barrel hood, I regularly wipe the rails as excess cartridge oil lubricates the rails. Which is all to the good as I am firing minimum loads and want clean and lubricated slide rails. Bullseye shooters regularly oil their pistols during a match, you will see them dropping oil on the slide and then racking the slide. I am wiping my pistol off, however I do apply oil on the end of the barrel, where the barrel bushing rubs. Generally shooters lube their pistols in some fashion every ten rounds! I saw one National Champ pushing a cleaning rod down his barrel every ten rounds, trying to keep the barrel and chamber clean.
When I get home, bullet wax, powder, just wipes out. The barrel is amazingly clean, no lead or jacket fouling what so ever. I use motor oils, cheap Hoppes gun oils, oils solvate bullet wax and powder fouling. I am certain at some point it becomes gummy, but that will be way after a dry gun gums up.
The shooting community has forgotten, but all of the pre WW2 delayed blowback machine guns used oilers. I am of the opinion delayed blow back was used because the cyclic rate was higher and the part count was less. I am of the opinion that as long as the oiler was kept full, the guns ran more reliably because oil reduced chamber friction and kept powder fouling solvated.
It is messy if you over lubricate. I once shot around 1000 rounds of 308 Cavin in a FAL.The FAL is a rear locker, hard on brass, tends to cause case head separation, so I lubricated my cases, and they are came out perfect without stretching. I used stick wax as a lubricant, which was a mistake. Stick wax is used on saw blades because the stuff stays in place. I put rounds in a plastic bag, tossed in glumps of stick wax, and shake and baked the stuff together. I had glumps of stick wax on the cartridges, so much so that when I fired the rounds, it rained stick wax. I had stick wax in my hair, glasses, clothes, etc. Stick wax does not dissolve in much of anything either, so while it does exactly what is wanted:stick to a saw blade, it does not wash easily in hot water and soap. It did lubricate my cases.
Heavy lubrication is a mess, oil is blown everywhere, yes it will collect dirt if you are in the desert. In Arctic cold, oil and grease will make the action run sluggishly. But you know what, I am not rolling my rounds or my weapons in the dirt, nor am I shooting on an iceberg. If I ever have to do that, I will have a lot more things to worry about than an oily weapon.
