Aluminum may well be a "soft" metal but so are the cam caps, rod bearings, main bearings, oil pump housing and so many other parts and pieces they pass through.
( I will see if I can scroll though some pics and post them up of numerous cam caps, oil pumps, rod bearings etc all having scores in them at extremely low mileages, not to mention how many times I have seen a "chip" of aluminum stuck to crank gears or transmission gears)
And as far as circulating, you do realize that not all of the oil goes through the oil filter all the time, there is the bypass valve (pressure relief valve) and that is always open to some extent when the engine is running, thus how it maintains the prescribed oil pressure. Otherwise you would have; say 20 psi at idle and 100 psi at redline
Theoretically you could get the same oil and particulate matter to bypass the filter with every pass through the pump. (unlikely but theoretically it could happen)
As far as the filter catching everything, yeah right. You do know the oe filters are only rated to 20 microns at 96%, they don't even rate them for anything smaller- but you can bet the percentage is significantly lower on smaller particulate.
I know full well the difference between assy lube and actual aluminum- pretty obvious distinction, remember I have been working on motorcycles for 33 years now.
So you go ahead and take your chances, I will not- I have had atleast 80 brand new engines apart with under 100 miles on them and know exactly how much stuff is left in the engine from the machining and honing processes. (engines getting set up for racing, but virtually brand new off the showfloor)
I think many of these forum posts on this forum and others, is just some biased bullshit because people want things to be easy and cheap. Not actually based on facts- just like all those who claim to have never needed to adjust the valve clearances, because "they were fine" what a crock of ****
We had this discussion before and in thousands of motorcycles that I have done valve clearance inspection on, never once have I found a motorcycle to not need numerous valve clearances adjusted..