Not with your foot on the back brake

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Tell that to the poor sod who died in Suffolk last year when his clutch let go.
OK expert set yourself up just as you say clutch in in gear n get a mate to knock your clutch lever out. Then ask him t help you pick your bike up .
What damage did your bike sustain when you tried it?
Try the same thing in Neutral with just your Front brake held! GS has linked braking and anti dive front so the effect may not be as dramatic as for "normal" bikes, but the rear force causes the front to dive, potential to lose a hand off the front brake and end up being pushed into traffic..... Now try with the rear brake only applied.... See the difference!
Dramatic clutch failure must be a rare occurrence, with a likely hood for stalling if stood still and if a common issue, manufacturers would have fixed the problem or at the very least have a warning in the Rider Manual for the bike not to be held on the clutch at traffic lights.......Still looking in the new GS manual to find it!
Off road riding also necessitates stopping the bike in gear and forgetting Neutral exists, to not do so would be in itself unsafe and place added difficulty for riders in many difficult situations.