I think its a market thing. You can have performance cores x efficiency cores. You do now want to be the one who proposes trusted cores x "lousy" (untrusted)

I think its a market thing. You can have performance cores x efficiency cores. You do now want to be the one who proposes trusted cores x "lousy" (untrusted) cores. The benefits, however many, would be lost in the discourse of "promoting insecurity". Such is life.