Honestly, I just dismiss all of the promos they throw at me.

Just yesterday I got an ad in the app "refer a friend and try FSD (supervised), and get $15!"

So I opened up the app just now and I suppose I got my answer that proves my initial premise was incorrect -- I need a hardware upgrade for FSD. Womp womp.

(That said, it still seems like the lane centering and brake/throttle behavior should have been easily fixed without a FSD hardware upgrade).