This, in my mind is an important distinction, which in conjunction with the OP's point (concerning the path other manufacturers should optimally take) cannot be overstated.
One need look no further than other manufacturers' implementations of, for example, Autosteer (lanekeeping) to get a good idea of substandard.
I would rather the bar be set *very* high for the players in this sandbox. Let them all canoodle as they are in the R&D stage. But you could pull most of what's out there today, and presumably tomorrow from most manufacturers and we would not be worse off for it.
Neverminding that the other manufacturers will have to end up copying Tesla's OTA approach for updates, and that will be a neat trick given the scale differences.
Finally, if Sir Branson's prognostication comes to pass (mostly EV in 14 years), and personally I think he's smoking whatever it is that billionaires smoke in place of crack, then the other manufacturers are even MORE behind not just in features and safety and updateability, but in infrastructure.
Yeah... the gap is not closing. Yet.