The magnets are a good idea and as mentioned earlier sure can not hurt. I have found they are also worth their weight in gold. When you have a failure of something like a roller rocker (needles) or chip the rim on a lifter etc. because they can isolate additional if not complete disaster. For this reason I use screens and mags in the lifter valley and cow magnets in the cyl. heads
oil return area. They can be secured on aluminum heads too pretty easy.
Most of the junk is not magnetic so either screens or the filter grab that stuff. The 25 bucks for an
oil analysis will identify overall engine condition with amazing detail. Many diesel truck fleets use it as a standard policy on
oil changes now. So much more than cutting an oil filter open to visually check things. Recent threads talked about hydraulic cams failing or manufacturer XX and warranty issues and so on. Have (engine, tranny or rear end) oil analyzed to check/identify problems first and use screens and mags to catch the little pieces if a part just fails.