Yes, this is when the TMC community helps itself. Instead of listening to "air is softer than coil", as absolute, it is more important to accept that air units (spring and damp), springs, dampers (struts), 18-21" wheels, joints, sway bars and tires (and pressures) ALL have an effect on ride/handling.
For instance, the most stiff P85Ds were air suspended, not the coil P85Ds. Plenty of TMC'rs liked those early cars. Plenty found those distinctly different part numbered air struts, and fatter sway bars, to be too stiff. The point is, the answers aren't easy but these "tells" from Tesla can say a lot. If David Z could obtain his receipt, and provide both part numbers (OE and replacement), It could help many. Palo Alto's gesture may not become Tesla policy, but as we're seeing, enough preferences are out there for some folks to at least begin trading.
The good news is Model 3 will come in the volumes that, no matter what part numbers people end up with, companies like Bilstein will likely offer custom after-market solutions as they do for many cars. I've swapped Sachs to Bilstein, on more German cars than I can count, going for both harder and softer. Tesla started with them on its coil Model S cars, and has since gone to lesser known suspension venders (Firestone for air, and a home brew from Mexico for its coil Model 3). FWIW, most auto-makers, including Porsche, aren't always reaching for top-shelf venders when they do a suspension. At 35k, these odds go down, no matter what you buy.
Wheels: Model 3 wheel choices are only 1" apart (not 21" vs. 19", as on MS). I'd agree those looking for softer should lower pressures, but also consider different tires. I used to use Hankook V12 for the street, on a car that otherwise had Michelin Pilots for the track. Same diameter. What a difference! It's akin to the difference a Model S owner got, when long ago they ticked a box for Michelin Primacy versus the stock Goodyear. To a lot of people, it's worth it.
"Jiggly": The jury in my own head is still out on this. I definitely feel it in Model S, I'd say more when the car is warming up. Chris Harris offered similar comments, in his YouTube review of the P100D. I tend to go back to thinking this is a minor issue. Porsche recently released a mock-up (because that's about all they do), showing Mission E. It's naked skate-board is remarkably similar to Tesla, but the strut towers are much lower than they are on Model S. I've also always felt both air and coil Model S go forward and backward a bit too much when you stop less than perfectly (I'm hopeful they tamed this in the "3". Anyone?). Lately, I'm thinking that, for as minor an issue as all this is, these things may be related.
