The tires are actually different. The saphhire tires have a cup compound in the center and 4s on the edges.Yup. Limited by traction and / or motor amps until 60 mph. Then limited by the battery maximum power output from about 60 mph and up. So I'd guess upgrading the battery won't do much for the 0-60, but would cut the quarter mile time to compete with Lucid.
Interestingly, the Lucid Sapphire has essentially the exact same tires as the Plaid, except the fronts are on 20" rims instead of 21s: "265/35R20 front and 295/30R21 rear Pilot Sport 4S rubbers". The Sapphire weighs 500 lbs more, so maybe that is how they put more power the ground to get a 1.89s 0-60?
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Realistically speaking the plaid is apex of a high performance street sedan. You’re at the limit of tire technology and road surfaces. Lucid is heavier with compromised tires that will wear out faster, almost certainly cost more. Plus they are on a fixed suspension compared to air for the S which is better for a street car.