One (just one of many) benefits of a mechanical clutch is that it completely separates drive from driven. Why is this a benefit? Imagine having any kind of electronic or electric component failure on your Varg when you are miles away from basecamp. If that happens, and you need to push your bike back, you are fighting with excess drag from the motor. The only way to separate drive from driven on a Varg is to remove the drive chain. In which case, use [and carry a spare] clip-style master link. An electronic clutch isn't going to help you.
It depends on how the clutch is implemented. For example, a clutch on an ICE bike is no better for pushing than the drag of the motor on an E-bike since you still have to turn much of the drive system. Clutching is fundamentally different than disengagement which is really neutral. And those are fundamentally different.
A clutch on an ICE bike does give you a kind of false neutral for stopping and is needed due to the limits of ICE power delivery, but it is not neutral (or full disengagement). The main use for a clutch on an ICE bike is for power modulation or for less experience riders "slipping". And this is entirely due to the limits of the power delivery system of the ICE. Dropping the clutch to loft the front wheel which is a kind of power modulation might be a benefit but I still don't see why that can't be done entirely with the throttle.
In my view, for a clutch to be really effective it must be part of the drive system and somehow be able to modulate power in a more effective way than the throttle.
I do however, agree with you that some kind of neutral might be good (especially for pushing the Stark which I have suffered more than once and now carry a chain breaker) but I don't see that as clutching which --at least in my view-- is different than disengagement/neutral.
BTW I think mechanical disengagement (say for pushing) could be solved at the "countershaft" or perhaps at the primary gear level with a mechanical controller on the drive train and there would be no need to clutter the bars another control interference. It would be good if Stark considered this especially for the EX IMHO.
