Now that the 20/21 option is available, I am having a tough time deciding between 20/21 and 21/22 all seasons. If I choose the 20/21, would I be sacrificing better handling and taut ride towards better range with the 20/21s?
I also had the same question. Regardless of DE or GT, whether the driving dynamics are a significant enough improvement to justify the range differential...
I think the big differences between the small and mid-size wheels have more to do with the tires than with the wheel sizes. (And remember that all the tires, no matter what the wheel choice, have the same tread width.)
In objective testing done by Tire Rack and several other outfits, the Hankooks on the small wheels are far and away the most efficient EV tires on the market, which is why their range on the Lucid is so much more than with the other two wheel options (and probably why Lucid chose them). However, that efficiency comes at a stiff price in wet handling. Dry handling seems okay, but the same tire tests that rate their efficiency so highly rate their wet handling capability smack dab at the bottom. Tire Rack goes so far as to call it a "challenge". There are also reports from users that they are prone to hydroplaning.
The Primacy Tour AS tires on the mid-size wheels give up something in efficiency but handle well over a wider range of conditions.
Given that most reviews have reported that the Gravity air suspension allows a very compliant ride even on the largest wheels, I really doubt whether you'd see a lot of ride advantage from the small wheels over the mid-size wheels.
Here's what Tire Rack had to say:
Here you see how efficient the Hankooks are, though. (Note that the max performance summer Pirellis that come on the largest wheels are also quite efficient.)
And here you see how the Hankooks fared in wet handling tests:
I feel like my account got stuck between the couch cushions! 
