we don't know that for sure, because nobody ever answers when i ask the question "are you considering standing there for 2-3 or more seconds holding the door handle waiting for it to unlock to be a success or a failure?"
if you're counting that as a success, you're not understanding the way this is supposed to work (or you don't care, which is almost as bad).
if you're counting that type of thing as a failure, which you should be, i stand by my thought that there isn't a single person who has had a 100% success rate with this (i.e. NEVER, not once has the phone key failed to open the car immediately). i'm confident there is nobody out there who can say that.
that is irrelevant to the discussion - here's why. you're using the idea that no fob is ever 100% successful to excuse tesla releasing the car with this garbage entry system...and that's not the case, because mine has been. i walk up to the volt, press the button on the door handle, door unlocks, open door. get in, start car, drive away. every single time for 5+ years...not one failure. that's why this is so maddening.
saying "no fob is 100% successful" is not the same thing as saying "your fob might not have had issues, but other people have." if even one fob on one vehicle can achieve a 100% success rate (especially one that's over five years old), there is no reason tesla in a 2018 vehicle should not be able to do the same. period.