It's not exactly true that there is no benefit being in neutral at the traffic lights.
Depending on the PIS (the software holds the clutch just beyond the point of engagement as I understand it) there might be slight drag on the clutch. If the car is in gear the propshaft (torque tube if you prefer) is held still by the gear engagement, which means the clutch drag will wear the clutch a tiny amount.
In neutral the propshaft is free to turn slightly, which means any drag is taken up by the shaft being allowed to turn, preventing that tiny amount of wear. I also know that if my car idles for a long time (5 minutes or so) in neutral, the clutch engages, presumably to prevent wear to the thrust bearing. This is apparent by a change in noise from the thrust bearing - a slight rattling.