Yeah, we can go on all day.
The paper filter media can flow a given amount and bypasses the rest. But, it catches more in the long run as oil circulates in the loop continuously.
The stainless mesh will NEVER filter as much as the paper media and doesn't really need a bypass valve because its nothing but a rock catcher.
IF YOU WANT TO PROVE IT, get some UOAs with particle counts. And, even if wear PPM is similar, a ferrographic analysis will need to take a look at the particles to see if the wear is severe or not. Easy enough to do for your debate.
We did have UOAs here with NO full flow filter at all. And, from what I remember, along with a UOA with a bypass only and no full flow(like the good ol' days). 10 years of UOAs in the UOA section is a good read.
And, food for thought. If you truly reduce 'wear' with no full flow, or reduce wear with minimal filtration(stainless mesh), obviously your oil flow is inadequate due to an issue(pump wear or OE under-engineering). Are you or K&P saying that the lubrication system in EVERY engine is borderline safe?
I'll stick with my full flow paper, blend, or synthetic media filter.
There is a theory (couple debates) on the full flow filter and whether or not it is a useless appendage. Obviously, you have so much faith in the K&P, you could have saved money and simply not run ANY filter by looping a remote oil filter adapter. There would also be no stainless mesh cleaning hassle either(which I have no faith in).
Just remember, there is a chain reaction of wear if you don't remove wear causing particles. Each time that particle loops around, it'll scratch a little more and more and...
Colleague just called. Need to do some project blasting. The viciously abrasive media that we're going to use is baking soda and might even have to go finer with baby powder. This is why I laugh at people who say, my oil/ATF doesn't feel gritty when I check the dipstick so it must still be good.