Ok, just to stir things up a little, here's why I think it's stupid:
1. Inevitably, some rider's trouser leg will slide down over one or the other kickstand-leg, unbeknownst to rider; subsequently rider will stop at a stop sign etc, go to put his/her foot down, find their leg is snarled/fouled, and immediately rider will fall over.
2. This kickstand fastening system interferes with (and reduces the effective amount of) pedal thread. The frequent use of this kickstand with it's long levers will eventually cause loosening of the pedal threads, followed by stripped threads if not remedied. Standard 9/16" pedals thread technology has been around for the better part of a century and is "adequate" but not when you monkey around with it like this.
3. The added weight on the left crank arm will create an asymmetrical muscle effort, leading to a "weird" feeling, and interfering with trained muscle responses and conditioning, at least with experienced riders.
4. The lopsided weight will make servicing the drivetrain and wheels weird and fussy because the left crank arm will be constantly falling down under it's weight.
5. Better, safer kickstands already exist.
Not an exhaustive list I suspect.