What you're saying is that that's kind of going to be a dead end because you can't just keep improving that route and get to fully driverless at some point, and then a driver is going to say, "This feels safe," and climb into the back, and something ugly will happen.
而你所说的， 就是这将是个没前途的死胡同, 因为你不能指望在这方面不断提高 就会在某个时候实现无人驾驶， 然后有驾驶员说 “这已经挺安全的了”， 然后转身去后座， 不幸就发生了。