If you take part in many successive experiments with observer-splitting, you will observe some limiting frequencies, but we have no clue what these frequencies will be. Do they depend on the thickness of the silicon wafers used to build our computers? Or do they depend on the algorithms running within our brains?

I'm confused by this comment. From the outside, I can tell you which observers will have remembered which limiting frequencies in their histories. What's an example of an experiment that would tell you something besides this?