There are things you can teach people and things you can't. I think being on time is hard to navigate as personal life can interfere with that, but it can be worked on. Family, sleep patters, traffic and location should all be considered. And not being able to use technology, I think both could be taught and worked on. I had a guy who was always 30-45 minutes late as he had to drop off his daughter in the morning. I completely understood his issue and we came to the solution that we would start his schedule at 10am and work until 6pm. It would actually give him a but more time in the morning so he isn't rushing to get to a 9am call then his schedule starts backing up all day.
There are important things you need that can't be taught, how to be personable, good communicator and smoothness. I personally would have worked on the troubling issues until I was pulling my hair out if I found someone who who checked more of the "unteachable" qualities.
