While I like the ideas with screens, and fixed buttons even more so, they haven't gone with them despite the tech being available for a considerable time. I do wonder if its mostly down to how people use them rather than a limitation of the tech itself. Watch how many people nearly swipe or even do scrape exit parking machines, even simple parking meters stop working, people struggle to use the ones inside, then add in weather damage/proofing and vandalism and I would guess thats a big part of it. As its often a closed queue system any problem becomes a major issue almost instantly.