Precise inputs on touch screens are difficult - your finger tends to cover up what you want to interact with.
In Designer mode, this problem is fixed with the incredibly useful Finger Aid tool.
It would be great if the same tool was also available during flight to point at specific parts as well as on the map screen to click on crafts, celestial bodies and especially to create and adjust maneuver nodes.
Without it, it's very hard to create nodes to intercept celestial bodies or any other task that requires precision.