Some BT’s do have a problem getting a Taavah for something they can no longer eat
Ask an FFB about Lobster and ask a BT about it. An FFB would likely be repulsed by it, but a BT might have a problem if he smelled one
I’m sure you would agree that despite someone having a taavah for it, it would still be assur.
I’m not sure why that part of the analogy to a smartphone doesn’t work for you. Whatever the rabbonim feel about smartphones (assur, unwise, only filtered, etc.) shouldn’t be affected by the fact that people have them, the same way lobster isn’t muttar for a BT.