Do you mean that as in "you can describe/encode arbitrary systems as a single number" or something related to that?

Yes.

For my part, I also consider it perfectly plausible (though perhaps less likely than some alternatives) that some humans might actually have tiered systems where certain values really truly never can be traded off in the slightest fraction of opportunity costs against arbitrarily high values of all lower-tiered values at the same time.

For instance, I could imagine an agent that values everything I value but has a hard tier cutoff below the single value that its consciousness must remain continuously aware until the end of the universe if such a time ever arrives (forever otherwise, assuming the simplest alternative). This agent would have no trouble sacrificing the entire solar system if it was proven to raise the expected odds of this survival. Or the agent could also only have to satisfy a soft threshold or some balancing formula where a certain probability of eternal life is desired, but more certainty than that becomes utility-comparable to lower-tier values. Or many other kinds of possible constructs.

So yes, arbitrary systems, for all systems I've ever thought of. I like to think of myself as imaginative and as having thought of a lot of possible arbitrary systems, too, though obviously my search space is limited by my intelligence and by the complexity I can formulate.