Tesla, notably, does not do one door at a time. For the same reason Lucid didn't do it. With proximity unlock, they don't really have a reliable way to know which door you are approaching. Bluetooth just isn't accurate enough. So if you went to open the back door to drop off a box, or something, the door would still be locked.
They could let you disable proximity unlock, and then only open the driver door on first press of the fob, I suppose. But maybe there's some sort of limitation in their hardware design that prevents that? Hard to say.