I don't think they fix issues on the spot in Fremont, & probably especially not now with the EOY rush. The delivery experience there now is "your car is in stall 71, good luck, bye," with little to no human interaction (so I'm guessing it's even less interactive than Vallejo). While this will be my 1st Tesla, my brother has had 3 Teslas over the years, all Fremont factory deliveries, my husband worked at the factory in Fremont (in production), and we have a bunch of additional Tesla nerd friends who have taken delivery of their Model S Plaids at the factory (the latter peeps having the same "your car is in stall 42" experience).
I'm picking up my M3 at Fremont tomorrow (12/28) & can update the experience here if it's anything other than the expected minimalist scenario. I will have the aforementioned Tesla delivery nerds out there but I'm hoping they don't (have to) pull out the paint micrometers, lol.
IMO, I wouldn't change delivery locations now b/c it seems you could risk not getting delivery by 12/31. With the out-the-door price of a RWD w/18" wheels at $40,940, it's too good to mess up!