This app & driver count problem is much larger than explored so far...
time for the UX team to be asking some hard questions "usage model" far beyond just the app...
A few issues that stand out just from recent discussion here, most I've listed are of the "multiple to 1 or more" class of problems, but I'm sure that a full UM analysis will reveal many other cases too...
Each "user" (person) should always get their own authentication (userid & password), so they can change that password as needed without affecting other users... sharing one login is never a good idea. This is "access control 101".
Each instance of an app needs to be able to control multiple instances of the car... I believe I've already read that some folks have ordered more than one (and if not, it is still a clear and obvious need if the company is planning for success... for instance the SA order for 100K cars ;-). Plan for success.
Each instance of a car needs to be able to be controlled (unlocked/locked/pre-conditioned/HVAC/etc) by multiple instances (at least "2", but not just "2") of the app. An ex-co-worker was part of a "five-some", and their car juggling was always its own (relatively minor) challenge... the instances of trupples, and live-in parents, "children", and work partners (company car, etc) who share the vehicle is far broader than just "a couple". Cars are for families (and more).
We have already read of the small to large driver transition problem, but it seems much larger than just the mentioned issue of a large configured driver as it exists for the case of just small drivers when others (configured drivers and not) need to get in the driver's seat (maintenance, valet, etc)... I could see something like usage of a valet card automatically pre-adjusting the seat to a default "large driver" position before it even knows who the driver is... but the full problem is far broader (should those external cameras come to play in this?). People come in many sizes and shapes.
And the "many to one" problem also exists for the driver profiles. As I understand it (we don't yet have our car), a configured driver is recognized by facial image analysis... I see that failing big time for my own usage model... most of the time I'll climb in with some sort of sunglasses on (ok, that should work) and sometimes with no sunglasses (hopefully that will work), sometimes I have a full, bushy beard but sometimes I don't... but come winter, half the time I'll have 10% light transmission (or less) sunglasses on and a balaclava (no face there to recognize). So, I hope "the car" has remembered the "many faces of me" over multiple seasons... People have many faces.
Ah, would that it was so easy to recognize drivers by facial recognition... how will the car behave when there are configured drivers that are identical twins (they occur in roughly 0.3% of births)? Multiple people can have the same face.
All very good notes here. Never share a single account when you really need two!
I am particularly concerned about the small / large driver problem, as it has become a real issue with my Tesla.
The Tesla, at least, attempts to set the profile by the phone or keycard that unlocked the car. Keycard is obviously reliable, but when we both walk up to the car, bluetooth makes deciding which phone is which very difficult. It gets the profile right roughly 70% of the time, which is not terrible. But sometimes, if I am driving, then step out of the car to go to a store, then get back in, the car will switch to her profile, even after I've sat down, thus putting me in a Star-Wars trash compactor type of scenario, where I frantically hunt for the profile button to switch back to me.
On the Lucid, my understanding is that profile is ONLY done by face login. (Someone please correct me if that's wrong.) That should prevent the crushing scenario, at least. But it sets the seat way too late, as I have to be sitting down in order for the seat to move at all. An Easy Entry type of default setting doesn't help here, either, because there is no one seating position where either of us could sit down and reach the screen or pedals.
My car should know who is driving and set the profile accordingly by the time the driver gets to the driver's side door, in other words. However that is achieved.
At the very least, being able to manually set the profile from the app would help. At best, something like Apple Car Key could help identify which phone is actually on the driver's side. I believe there is an equivalent for Android phones, as well?
Love the idea of a default valet profile, too.
Cars have many users, indeed. Even if I have house sitters and want them to be able to use my car temporarily, I should be able to accommodate that via the app.