I've never ridden a full suspension with a hub motor so I can't say, but my guess is that yes, it would make a pretty big difference with an aggressive rider or poor quality streets. It's not just keeping contact that matters, its the consistency and quality of contact, especially with a super torquey motor ready to jump at a twitch of your thumb. Its of course not necessary for commuter biking, but neither is basically anything on this premium product aside from the wheels and pedals.

Also to note, they are very much marketing it as a trail bike in addition to a commuter so it's not surprising they would spend a bit to optimize for ride quality and traction.