You need to keep the bus "captain", because half of a bus driver's job is helping old people figuring out which bus to take and where to go and keeping the passengers in check (to prevent vandalism, throw out rowdies or even call the police if there is violence among the passengers, etc.). Occasionally it does not feel safe to take the bus as it is and without a driver to call the police if something happens, that would be the case much more often.

And if you need to keep at least one employee in the bus, why would you take them off the wheel and very likely increase the risk of an accident, while also making it more complicated legally in case an accident happens. I don't see a gain, unless the end game is to get rid of employees inside the bus altogether in which case the service quality would decrease drastically, because that half of the bus driver's job I talked about earlier is ignored completely.

Maybe it's a good fit in that specific case with the "pre-selected roads", but I am legitimately concerned about this technology being adopted widespread (esp. in the cities) and I don't like the thought of it.