Interesting. Millions of engines have been made that doesn't use an oil pump and filter. There are also a whole bunch that have oil pumps and no oil filter like some Briggs, many aircraft engines, Volkswagen beetle engines to name a few. Haven't really heard of many of them failing due to issues related to poorly filtered oil. Everyone should use the oil and air filters that make them happy. I have used cheap filters and expensive filters and really haven't seen a difference. Continential engines used in Cessna's have a very coarse screen to filter the oil. A&P mechanic told me "no filter is more reliable than any filter." Use whatever makes you happy and mows the grass.