One of the more consequential differences between Samkhya's manas and the everyday sense of "mind" is that manas, for all its coordinating work, is not where thinking-as-awareness happens. Consciousness in this system is the exclusive property of purusha, which does nothing; every cognitive operation an outside observer would call thinking, perceiving, judging or deciding is instead distributed across three distinct tattvas, manas, ahamkara and buddhi, none of which is conscious in itself, and all of which merely appear conscious through proximity to purusha.
This distribution matters for how the system explains ordinary experience. A single sensory event, catching sight of an object, is analysed as a sequence: an organ of perception makes contact, manas synthesises the raw data into a presented object, ahamkara claims the object as something "I" am seeing, and buddhi renders the resulting judgment about what the object is and how to respond to it. Only after this whole unconscious sequence completes does the appearance of an aware subject having a unified experience arise, and that appearance is, on Samkhya's account, exactly what it is, an appearance, produced by purusha's mere presence rather than by purusha's participation.
Placing manas among the eleven organs rather than treating it as a synonym for consciousness is therefore not a minor classificatory choice. It is the clearest single illustration of Samkhya's central and most demanding claim: that everything ordinarily called mental activity is material, and that consciousness itself contributes nothing to the process it seems to be having.