I want to say that it doesn't come with it because it is made for the AUS market. I bought the 4 way pigtail at the store and wired it on to the end.
Instructions aren't the best but it is pretty straightforward. Best rack on the market regardless.
Could be, but I don't think they mean to ship the light kit without a plug. The AUS site says it ships with a plug, and the US site says the "carrier is supplied with everything needed to use it." They have to leave the plug off for the wire to be fed through the rack, so it makes sense not to ship it installed. I have a good crimper and the rest, but not everyone does.
No doubt it's a premium rack at a fair price. I just see room for improvement to get them from a 9/10 to 10/10 product. My guess is that the extra holes are there for other products, like their bicycle racks. That's smart of them, but with the small selection of models they ship, it wouldn't be difficult to reflect the changes on the instructions.
It's a minor thing to you and me, but a little extra effort would make their racks even closer to perfect. My friend with a terminally parked BMW lost his mind when the exhaust changed colors after a few hours of run time on The Precious, and complained about it to the dealer. If he ordered this rack, I'd get called over to fix it before he threw it away in frustration.