You are right, these semi automatic blowback rifles are running extremely clean.
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I cleaned my PC 9 after ~ 140 rounds, and here is one of the rags, as you can see, extremely clean.
Clean is in the eye of the beholder, like some people never wash their hands when they come from the washroom, but they insist to shake everybody’s hand.
While I disassembled the Ruger, I could see how well it is built and how relatively easy it is to disassemble and clean.
I am still convinced that a semi auto blowback rifle must be built for easy disassembling and cleaning, unlike the// Homesteader.