Use interior organization when objects lack dependable homes, move during braking, mix incompatibly, overflow storage, tangle, or require repeated searching. The needed mechanism is zoning, containment, restraint, and appropriate retrieval—not a change in what the occupant's body feels.
Use interior comfort when the unmet outcome is pressure distribution, posture, thermal balance, airflow, sound, glare, touch, reach, motion tolerance, or fatigue. Convenience can blur the choice: moving clutter may reduce awkward reaching, and a support may create temporary storage space. Classify the primary failure, then test any secondary benefit separately.