BMW and Porsche are well established entities, hard to put Lucid in the same category in 2022.
We are talking about a company that struggled to get the first batch out the door (DE) and then to get enough logistics in place to get the GT and GT-P cars produced in any volume. For my GT-P I wasn't able to order 19 inch wheels period (you can for a GT).
To be direct, going with the 21 inch winter tires, considering the short sidewalls in places like Chicago is not money well spent. When my car was delivered, they didn't even have the 20 inch wheel shipping so not an option then. I agree they should get a winter tire selected for the 20s. I also believe the take rate for winter wheels and tires may be limited. Many folks are fine with all seasons and call it a day.
I believe the TPMS charge would be one time. The 2 times a year charge would be for the wheel swaps. I actually like having my higher power cars in front of a technician a couple of times a year to see if something is going on. Small change cost relative to these six figure cars. Our OP shared that for the nice, friendly folks in Canada, it cost around $300K to enjoy this car. Is it really worth saving $185 to have to stare at the stupid warning light on the dash half the year?
I don't particularly like the design of the 19s myself. I went with them because the local facility told me they would not touch anything non factory specified (clearly other service centers are handling it differently, in my work world I refer to this as Geppetto's workshop, many people doing the same job, none of them doing it the same way) and it's Chicago and we will have winter. At least Lucid created one Winter set up and made it easy to buy directly. They even brought my Summer wheels to my home for storage and left me some really nice towels to keep them separated (no charge). For my Gen 2 NSX and my LC 500 Convertible I was on my own to figure out winter wheel and tire set ups, and we are talking about Auto powerhouses Honda and Toyota.