Actually how do you know this? Are you sure Mercedes isn't doing fleet learning and/or mapping with their lane assist cameras? Just because they're not publicly saying they do doesn't mean they're not doing it.
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I'm 38, and think autopilot should be the number one priority (assuming resources are limited and indeed it is a binary choice between bug fixes and moving to full autonomy - in reality I think we'll get both eventually).
I don't know about Ampedrealtor and the OP for this thread - Brooklynrab - but I have been ignoring vehicle OEM interfaces for years now and simply using my phone. Why? Phones improve at a more rapid rate than vehicle OEM systems do, and Android is so good now that I don't need my car's built-in system to do anything.
I can pick up my Droid Turbo (or speak into my Bluetooth earpiece), keep my eyes on the road and without hitting a single button say "Navigate to 123 Smith Street, Anytown, USA" and it just does it. Voice imprinted, voila. Auto-re-routes, always updating the OS - I just don't care about my car's built-in interface very much.
If the car has the ONE MOST IMPORTANT KILLER FEATURE - AUTONOMY - THAT IS THE GAME CHANGER. If the car can drive me down the road safely, allowing me to take my hands off the wheel and eyes off the road - I can fiddle around with an imperfect interface happily for hours (what else would I do? You can only listen to so much NPR and audiobooks before you need a break).
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Also - no matter what the whiners think about their imperfect interfaces - Tesla's sales are exploding. Model S up 46% year over year for 2015, while the luxury ICE makers, including BMW, Benz and Audi (with their refined interiors and perhaps less buggy interfaces) all showed double digit sales declines in the S Class, 7 series and A8. So whatever it is that Tesla is doing with its limited manpower - it's doing something right.
And I'm another data point - I can buy any car I want, and have enjoyed BMW's and Benzes over the years - but I've got two Teslas on order and I'm selling my E55 AMG. The autopilot and electric drivetrain are so compelling they FAR outweigh any buggy interface.
IF today Mercedes was selling an autopilot with the Model S's capabilities, and Tesla was selling Benz's gimped, error-prone lane assist system I would immediately buy the Benz instead. That's how important self driving is, at least to me.
Full autonomy is so important that I'm leasing these Teslas (which I never do - I always buy) because I want very badly the next level of Autopilot which I imagine Teslas will have out shortly. So yes - if you want some real world data on what is driving sales - it's autopilot, at least for this pilot.
A faulty OEM nav system, a buggy internet radio interface and other interface glitches - those are so far down my priority list that they don't even rank in my decision making process on a car purchase.