That does indeed sound enticing, but I also really like the Deutsche Bahn ticket machines: not only do these have options for the most usual tickets, they also have the full journey planner system built in. That means you can purchase tickets valid across multiple fare zones - like the National Rail website in Great Britain, but in a vending machine! Additionally, you can use this to find information in advance, like what the platform for arrival will be, which can save some time when making connections.
If you're going to put a touchscreen on something, you might as well do it properly! :)
I find staff are even better for journey planning. Shame we've mostly replaced them with machines
Now we get to stand there tapping 13 times because the touchscreen sucks. And worry about being taken to court because the machine was broken. Yes "most" people have phones but public transport needs to cater to all
If you're going to put a touchscreen on something, you might as well do it properly! :)