Low is the "standard" setting now, my Dec 17 delivery is the same. Apparently they aligned in low, this is an effort to avoid the shuddering issue. We have almost 8k on ours at this point, no shuddering on acceleration yet.
Words of advice, I bought our X knowing it was very likely I would be making some trips to service center for the common issues like fwd seals and sensors which has happened. Our X is actually in to replace sensors in fwd now due to the heat issue. I expect after this latest trip that our car will be problem free moving forward.
Some people let these minor issues seem like a big deal, they are no big deal. I look at the positive, we got to our 2-3k miles on loaner model S while ours was in for service.
Additional words of advice, you get better treatment when you treat people with respect and don't blow things out of proportion. My wife showed up to drop X off at service center and another owner (female) had shown up just before my wife. The otherness lady was losing her mind and being rude, my wife was polite and understanding. Guess who got the last model S loaner and was thanked repeatedly for being understanding?
Story brought a smile to my face, I hope it was one of the constant whiners now found on TMC that had to drive the ICE.