No chip costs would be infinitely preferable. Badge costs are barely noticeable unless you’re out of them, in which case a small amount of raiding can last a while. Hero chip costs for red skills, mods, and stars are already a huge challenge; speaking for myself, I’d prefer getting a good number of memories for each chip to having fast missions or no badge costs.
I think the problem we’re having is that PerBlue is defining “efficient” as “fast”, while those with a similar viewpoint to my own think of efficiency as how much value we get out of our resources (in this case, hero chips, which are needed in bulk to build a hero up to the point where they can be used competitively).
But that’s only my own two cents, anyways. I’ll probably just ignore the memory missions.