Just a few thoughts on single charger vs dual charger. I was pretty confident about all the other options and never really questioned my choices, except the dual charger option. I decided against it when I ordered, then called to have it added and the Tesla rep explained why it was really not worth it. I ended up not adding it. In the first few days I was a little torn. Adding it later is so much more expensive.
After 10k miles I can say I never missed the dual charger a single time. There has never been a moment where charging at 60 miles/h would have made any difference compared to 30 miles/h. There was one station that had a Tesla HPWC but I stopped there only to check out the place. Nowhere else could I find a charger capable of more than 10 kW. Every time I use a public charger at a mall or store or park or Disneyland or similar I'm not in a rush to drive anywhere so charge speed is not an issue at all anyways. Again none of them support more than 7 kW anyways.
When I'm on road trips I use Superchargers. Nothing else cuts it. Even at 20 kW it takes way too long to charge when your goal is to keep moving.
Overnight charging, which is the most common way to charge is well covered with a single charger. Worst case scenario would be coming home with a totally empty battery and then needing a range charge for the next day. It takes about 9 hours to do that on a single charger. No problem. My daily drive is a little over 100 miles so in my case I'm more than fine with the single charger in any case. I need about 3 hours to be covered.
Yes, one can always come up with a scenario where a single charger wouldn't cut it. Just as much as one can come up with a scenario where a dual charger wouldn't be enough. My point is that even in heavy use like I do with 100 miles of daily driving, the 10 kW single charger is more than fast enough. For road trips the dual charger is way too slow, that's why there are Superchargers. The moments where the extra 10 kW are available and make a significant difference are not common. I'm not missing it at all. I will gladly spend the money on a CHADeMo adapter. I think that will help me out more as it will allow me to add a significant amount of charge quickly and those quickchargers are way more common than 80 amp capable L2 chargers. So the likelihood if being able to make use the CHaDeMo adapter vs dual charger are much higher.