My best guess is that Tesla is using the random "transferable FSD" option as a way to control not sabotaging profits if they were to apply FSD to the Account instead of the VIN.
Tesla will always figure out a way to get what they want at the expense of anything. There are no emotions attached to Tesla in what they do, with the exception of maybe keeping the S and X models alive due to sentimental reasons, but for everything else it's just business. Like trading, we just need to study and make the right entry point. It's all a game.
I'm also in the market for a S and have dabbled into looking at Lucid. The biggest culprit for me with Lucid is the horrendous CCS port (soon to change) but also to some degree the Software UI. Tesla has by far the best software and it's a big determining factor for a lot of people, despite the other flaws and inferiority that Tesla posses over actual luxury cars like Lucid.
Fun fact: Lucid has discounted some of their in stock inventory up to ~$30K or something insane like that. A lot have been sold, but there may be some outliers left.
I think in a few years, if not a lot sooner than we think, we'll start to see some surprises from other OEMs with their advancements in Autonomy. The EAP like systems in other makers right now are really good and in some ways better than ours. When it comes to FSD, this is where Tesla is rolling in the bank of data, but that doesn't mean that other OEMs aren't working on their own tech as we speak.
Although they all, including Telsa, have flaws to some degree. watch out for Mercedes and HMG products. They have excellent driving assistance in their own way that top the rest of the legacy makers. Ford Blue drive isn't bad either.
Exciting times...