Are there any advantages to the gullwing doors compared to sliding doors other than "sliding doors aren't cool"? They say "minivan style sliding doors open at most halfway", but there are plenty of minivan doors that open quite wide.
If you watch the video he shows exactly this. Sliding doors take space.
It should give more clearence for getting into the car; and better access to the third row
Looking at the video, it's quite clear that accessing the third row of a full size minivan is quite a bit easier than accessing the third row of a Model X.