The reservation list is also a great marketing pull for Tesla, which I don't mind because I am waiting for a cybertruck and I like what they are doing over all overall (warts and all). Having said that though, for long term ownership, I'd rather get one built in Yr2 rather than Yr1 because it's taken that long for M3 and MY production line to work our most of the clunkier issues. By Yr3 build, each of the cars are fantastic.
But there is also the getting your new toy first rush. It seems some of the build issues are always fixed by the SC after you get the early builds anyway. Not all though. A friend who is one of the earliest Model X owners with non-fold-flat middle seats is really annoyed and talks about it many times.
I don't think Tesla has ever hidden the fact that the deliveries have been based on location and profitability before the position in the pre order queue. The dual motor is what they're building first, the single motor will be a year behind from what they've last said officially.