I'm wary of a situation where you draw on the screen and nothing happens because your pencil is still registering as 'in use' despite being in a drawer somewhere.
Thinner line should be doable, non-Pencil input I'd have to investigate more - I know they have palm rejection support, but I'm not sure how reliably we can detect that you're currently 'using' the pencil and I'm wary of a situation where you draw on the screen and nothing happens because your pencil is still registering as 'in use' despite being in a drawer somewhere.