In summary, I think your comparison is biased towards the Audi.
I tried my honest best to make the two cars as similar as possible. If I was trying to bias towards the Audi, I'd have mentioned, for instance, that Audi's Google Maps integration blows away Model S's - with both 3D, heading up and voice control that can understand an address you speak. I'd have mentioned that Audi's rear camera has guides that are tied to the steering wheel to show you exactly where the car will go.
If you think the comparison makes the Audi look better, that's your view. Others will disagree. I'm not buying an S6 over an MSP, but I find the comparison compelling. It also shows where Tesla needs to go to continue to compete in this market segment.
For instance, the Tech Pkg is
needed to get xenons, Homelink, backup camera, turn by turn navigation, etc. that are standard on the S6.
I also added the Carbon fiber inlays and rear seat airbag options to the S6: those are no-charge in MSP. If you're not getting carbon fiber interior in MSP, then the price difference goes up another $350.
Twin chargers were a must for me, since I travel routes that have 70 AMP J1772s but no superchargers planned (eg, Hwy 101 in CA). If you don't need the Twin Chargers, drop $1500 and the difference in price is still right around $20K. So, your question remains answered.
If your use of Superchargers will reduce the mileage for the TCO break-even point by 3500 miles, by all means, use 96,500 instead of 100,000 miles.
Since S6 comes with a sunroof standard, you have to configure MSP with one for an honest comparison. If you want to consider MSP's sunroof as better because it's bigger (despite the prison bar), that's OK, but S6's sunroof slides into the roof and so doesn't have the noise and aerodynamic problems that Tesla's does. It also has a shade, which some people apparently prefer. But, configuring MSP with no sunroof isn't fair. Maybe Tesla should offer a more normal sunroof for less money.
While MSP has 21" wheels included, I did add the top wheel option from Audi. Both have 35 aspect ratio tires, so that seemed fair. On the plus side for Audi, there are 18 instead of 7 "Max Performance Summer" tire models available for that size, and also a number of "Ultra High Performance All-Season" tires available versus none for the MSP. I personally like the look of Audi's 20" better than the turbine design of MSP's, and the turbine design will be harder to hand clean. OTOH, the grey color for MSP is pretty cool.
If you're trying to make a case for MSP being delivered to your door as a real purchase reason, then I think you're grasping. I feel I was being more balanced. And, it's SOP for car salesmen to spend a couple hours going over the car's functionality with you - that's not something new from Tesla.
Finally, options not available on either car are important to mention, since those may sway one's decision either way. For instance, if your garage is narrow and you need power folding mirrors (not to mention 3.5" less width), then you might be forced into S6. If you really like the 17" touchscreen, that might make up for lack of other options. If you're uncomfortable with visibility out the rear window, you might not be comfortable in MSP. If you drive in snow, then you might need Audi's 4WD.
I believe I've made it clear that I think Tesla has done a fantastic job with Model S. That doesn't mean I have to ignore where it falls short, or where I disagree with the design decisions made. I completely understand if having the best drivetrain on the planet means to some that what Model S lacks is less important, but I also understand that for other people there are other factors that are important.