If folks aren't convinced well try a test. do a few mags one way and a equal number differently. Give it a few years and see how things work out.
I've already done that. In fact, I've "given it" exactly 46 years when I purchased my first semi auto weapon with a detachable magazine back in 1973. (A Colt Gold Cup). I have never had a single issue with dirt "gumming up my magazines".
As I said before, this is simply common sense. Using oil or grease as a rust preventative is almost as old as time itself. What kind, along with how much, and how often it should be applied, as well as cleaned, is all in play.
We have been through much of this nonsense with the AR-15 / M-16 rifle. People were clamoring on about how using too much lubricant in, "the sandbox" would cause rifles to malfunction. The government conducted test after test, and found it to be hogwash. Heavily lubricated M-16's / AR-15's
always had fewer stoppages, regardless of conditions. Over the decades I have seen countless firearms malfunction due to a lack of lubricant. I have NEVER seen one do so because of too much.
Yes, oil and grease will hold dust. It won't "attract it". So if you operate your weapon in a dusty environment, you may want to use less, and clean more often. That doesn't mean it's an automatic death sentence for you and the weapon if you choose to use it. Again, this is common sense, nothing more. It's not a Moon shot.
Firearms manufacturers recommend you don't do a lot of things. For example, every single one of them puts a bold faced warning on the owners manual of every centerfire model they sell, warning NOT to use handloaded ammunition. They tell you it's, "dangerous". And that, "it will automatically void your warranty".... Does everyone participating in this thread adhere to that warning? Why not? The manufacturer warns against it.
I have been keeping a light coating of oil on the surfaces of my firearms, (including the inside of my magazines), since I received my first one almost half a century ago. I have never had an issue because of it. I have also used almost nothing but handloaded ammunition in them for almost the same amount of time..... Again, without a single issue.
Until I do, or until I die, I will continue to do so. Perhaps I just like, "living dangerously".