Seats were by far my biggest gripe. Took a while just to find an adjustment that didn't make my lower legs go numb. They have almost no lateral support, and the bottom cushion is fairly short -- my legs were overhanging by a good six inches or so. That pressure point at the front edge is most likely why I was getting the tingling.
It's so easy to contract with Recaro for seats, but Tesla really wants to be vertically integrated. They've improved the seats already at least once on the Model 3, and a couple times on the Model S, so I'm hoping that the Model Y will be comfortable.