This is an interesting point that comes up on the forum pretty frequently.
Is a design intention a promise?
When Tesla said that it wanted to put lighted vanity mirrors in place (that never appeared), was that a promise? a desire? a design intention?
When Tesla said during the reveal that Model X would have a large cargo carrying capacity, was that a promise? a desire? a design intention?
When Tesla showed a slide that suggested the seats would fold, was that a promise? a desire? a design intention?
So is Tesla not permitted to change anything they've said in the past? I know the response of many typical executives to that: then we won't say anything at all, you get what you get and you don't throw a fit (Apple handles things this way).
If Tesla had assigned a communications rep (like George B did in the early days) to respond to the "hot" threads here, describing the company's specific trade-offs on the hot-button items, would that help? Or would Tesla still get some of the posters we've seen here saying "that's a complete deal-breaker, Tesla's completely stupid, they'll be out of business next week because my preference wasn't chosen in the trade-off!"
I know they must be struggling with that, too. They've seen hundreds of their intentions get mercilessly killed by others when they couldn't meet a date, or couldn't make something work. On the seats thing, I assume they ran into serious problems and had to make a tough trade-off decision, knowing some customers would be unhappy and would cancel - but c'est la vie.
(Not complaining about your post, Dirk, just something that bothers me. I view Tesla as one of the ultimate "agile" companies who can practice continuous delivery without using model year as a crutch, but I'm also concerned that Tesla's customers will drive it toward that type of an approach. I've said it in other threads on Model S as well. I believe their business model is the future, but customers will have to adapt as well.)