Fascinating research. Yeah, I tend to think that beyond whatever our number sense gives (1-4 instantly, or between 8-20 depending what you measure) the rest slides in. I think it’s logarithmic – which would be why 1-4 is instant: first, second, third with corresponding reduction in intensity/ importance. Our equally spaced number system comes later.
Oh a reductive unit-to-end-all-units? No, I don’t think so either. But there are general mechanisms in common I suspect. Tendencies as it were.