I try to be as fair as possible and hence I will write a follow up to my post above.
Luck wants that the day after I posted here, upon calling the Millbrae service center really not expecting much, someone finally picked up the phone! Hooray!
I was again told the service center has a large backlog, they are trying their best and are aware the current situation is not ideal. The service advisor I had been texting with and that stopped replying apparently got into a really bad accident and was gone for almost 2 weeks, hence many customers were left in limbo (I wish him the speediest recovery). The service center was trying to get other folks to join in to pick up the load. I was also told Lucid is building a new service center in Bay Area, expected to come online later in the year.
The service center dispatched a mobile tech that came over 2 days later. Again, he was very well aware of the delays that many customers are experiencing and Lucid is trying to get back on track to provide a great customer experience. Unfortunately he wasn't able to solve the issues for which he had been dispatched, simply noted them in his records and downloaded some data from the car. I now have to call them again to bring in the car for service.