"Can't" in this case means "not allowed to". It doesn't mean "incapable of".
Las Vegas has a long history of artificial limits on people-moving systems. So far there are still no trams or even well-run bus service between the hotels and the airport. There are a few trams that run mostly between same-company properties, and a somewhat helpful monorail to the convention center. But even those have inconveniently placed stations requiring long walks through the casinos. Helping people to leave the property is not in the interest of the owners, and facilitating cheaper airport transfer is not in the interest of the taxi companies.
(Having said that, Vegas is far from incompetent regarding tr.ansportation or anything else. Things do work and there's a reason for everything, but saving customers money, or letting them go somewhere else to spend it, is certainly not the prime consideration.)
The Boring tunnel project is clearly constrained against becoming a true model of automation and efficiency. It's not a technology limitation. It's very clear that FSD, or a specifically-trained version of it, could easily replace the human drivers.
I haven't really thought before this thread, about the idea of Teslas doing their own parking at various holding lots and trucking/shipping assistance, but it makes a lot of sense to me.