If engines were having problems due to dirty oil I'd say it was an essential modification. While an advertised benefit is that the oil temperature will be more stable, it also takes longer to warm up the oil. Personally I'm not one of those people who worries about every little thing unless it will cause a big problem.
Providing you change the oil regularly you shouldn't need extra filtering.
I read many years ago (BBC's Tomorrows World) that they developed an oil filter that lasts the life of the engine it was something like a toilet roll. Then again they would sell many filters would they?
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