Aw, don't play dumb
Clearly, you applied the comment to a different case. Anyway, apology accepted.
So, what do you make of manufacturers that use magnets in their original engines and transmissions? Some are attached to the drain plug and meant to be cleaned at each oil change (Husqvarnas) and some are to be cleaned during a major service when the pan is off (Toyotas). Neither are for inspection purposes, the manuals just say “clean them.”
Huskys generate a ton of engine-trash and IMO need all the filtration they can get. Toyotas, not so much. I would guess the Savage falls somewhere between them in terms of junk sloughed off the engine parts, and general engine stress.
Then we have the manufacturers not wanting to make maintenance a bigger deal than is necessary to make the engine last as long as the rest of the vehicle. So the designers come up with various screens, paper filters, magnets and centrifugal devices that they think will provide adequate filtration while not making maintenance too much of a PITA. The ones that incorporate magnets into their designs aren't exactly the copper health bracelet wearing, placebo-popping idiots you might imagine. Magnets catch stuff that is bad for engines.
Adding a magnet to a finished design might well go beyond a “point of diminished returns” and the owner might never notice the difference in wear. That is the point I think you are trying to make. But you can't say the difference is zero, and you don't know how significant it is. The magnets do indeed catch abrasive material that would otherwise be circulating around the engine. So an owner that chooses to run a magnet is reducing the wear on the engine to some degree. You can call that insignificant, but you can't call it nothing.