Where a Tesla has similar components and designs as other cars, the front suspension is going to be totally different than 90% of other sedans it's size.
Other than the lack of CV joints (I had thought the S was all-wheel drive, but you're correct on this point), what specifically is different regarding the front suspension? Does it not have upper/lower control arms and tie rod ends with joints that wear?
One could argue that sealed systems are less prone to wear because the dust and grit cannot get in and the grease cannot get out, but I'll skip making the obvious point.
You could argue it, but the worn (sealed) suspension parts in my '02 Sierra that I'm about to replace at 116K miles would tend to disagree with your statement (the joints in my '86 Silverado with twice the mileage are fine, but then they've been kept greased), as does the fact that almost everyone I've seen that did the replacement themselves replaces any sealed parts with greasable ones where they can. The Moog parts I'm replacing them with (which are far better than the factory parts) come with zerks - no drilling required. The worn ball joints and tie rod ends in my truck likely aren't dirty, but they *are* dry. Grease (even synthetic) doesn't last forever, and in a sealed system, once the grease wears out, the joint follows soon after and there's not anything you can do to prevent it. You're absolutely correct that most people with greasable parts don't follow the recommended maintenance schedule, and the sealed joints do last longer than an *unmaintained* part. They generally are also designed to be a royal PITA to replace (for ball joints, anyway), so most shops replace the entire control arm assembly at a much greater cost. They most definitely don't last longer than a properly maintained part with zerks though. Any decent 30-minute lube place should be taking care of anything with fittings anyway.