That's a bit of my point. The brakes weren't in the original 76K even, but were added later via tweet.
I'm guessing when they looked at price sensitivity, they figured anyone who had bought the original P version, would stick with the fully loaded package. Sure, they might lose a few folks here and there who really didn't want the 20" wheels, but were more - getting them to sell because they were included and there was no discount for getting the 18's before. Or ones who wouldn't find it worth it to pay for white, but got it just because it was "included" before and added to a bit of that exclustivity. Maybe even the same for paint colors. But by and large, I'd expect most original "P" orders - stayed the same config just at a lower price.
But they didn't just drop the price 6K and say - let's see how many more people buy it now. Nor did they make everything an option, so as much as I'd love to say - give me P with the brakes and 19" wheels which aren't even a "P" choice, but keep the spoiler kind of thing, no dice there. So the packages are still that - and I'd believe designed to include some things they expect people want with others they don't - continued attempt at maximizing profits while minimizing variance.
But if the analysis showed an arugment that said, the best price to maximize profit was 65K and another said 70K, does this allow them to test both a bit? Did they say, instead of dropping the price 6K, we really should drop it 10K, but that will hurt our profitability thanks to the freebies you've thrown in, Elon? Let's throw those in with the "sticky" tires you tweeted about. Have they even finalized the brakes? I mean, we've seen that production car in a tweet from Elon under the tent, but it's not like anybody has one.
I'm as happy to speculate and guess as the next guy while I kill time waiting for my car. I'm just saying that I'm less in the camp of "someone" at Tesla knows exactly what that configurator means and they just don't explain it well/consistently internally or externally, and more in the camp of - it's nebulously written because they haven't really finalized it yet, but want to know what they need to make when they do sort it out.