Word is that the kick shaft wears quickly, so it should be used in dire emergencies only, i.e., you're stalled at the bottom of a sand wash and your battery is a bit flat, and won't spin the motor.
My '93 GS/PD has one and I've used it 3 times--each time to prove to onlookers that it works.
G/Ses had the kick start standard.
The Electric start was an optional extra.
In some markets all the imported bikes had both e.g. all the bikes that came to OZ had the electric start. I think you would have been able to do a special order and get one without an electric starter .. if you waited a year or so...
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The GS es had the electric start standard, but no kick start. I don't know if they offered the option of a kick start.