The SR is an inferior car. So are the Corolla, RAV4, CRV, Sentry and Camry - the 5 best selling cars in the world. The SR is the car that the world will own - or something even more inferior. The best selling BEV in the world right now is... the
Wuling Hongguang Mini EV. It's a tiny little suicide box, but it gets people in China where they want to be. We need to remember that most people don't give a rip about their car. It's a necessary evil in life. They don't want to spend a lot of money on it.
The reason that the LR is so mainstream is that we are in the early adoption phase for BEVs. That's people with money. The greatest concern about BEVs right now is the whole range anxiety thing. So naturally there's a push for vehicles that have range. Tesla wants to bring in as many profits as possible, so they've prioritized LR and P models. That moves the LR along, and that draws more orders. Interestingly, the P is not swamped, despite the near-instant order fulfillment. The LR just happens to hit the sweet spot right now. I expect that, in time, the SR (or a vehicle like it or inferior to it) will come to dominate in the world. Probably in the US as well.
This is ignoring possible developments in new battery chemistries that could change the entire market. Lightweight batteries. Higher performance batteries. Cheaper batteries.