Now that we got that out of the way, if you're subframe is grounded, your electrics are still going to get fried. They're just not designed to handle an inrush of such voltage. If you were not grounded, you're correct that the car would be fine. However, as soon as you're grounded, all bets are off.
When you are on the way to a show and blow an air line, but say screw it and drive there fully deflated on one rear bag anyway. Then you fix it at the show to a crowd of onlookers and win first prize in the MKV division.
When you have people constantly tell you something is wrong with your car, like flat tires, broken suspension, etc, on a regular basis. Happens especially at work.
When you dream about that little "hiss" sound that an air leak makes. Sometimes you even CONVINCE yourself it's there when you know damn well it's not.
You know you are on air if....
...all the older people in your building who thought you were a clean-cut young professional no longer want to look at you because you drive "that car".
...your dog no longer needs a running start to jump into the hatch.
...your parents say "if it was meant to be that low, it would have come that way".
...you make sure you pick a parking spot with no weird holes or bumps before you air out.
...you laugh when you scrape over speedbumps because you can't believe you are that lazy not to air up.
...you get people popping their blow-of valves at you in traffic, so at the next lights you say "I can make that sound too" and air out.