I'd say there's one primary "potential to improve" - a mobile app. The situation is better than it used to be, but frankly still not good enough IMO. Otherwise, an org-mode + Dropbox combo works perfectly for me; every computer I own or work on has Emacs installed anyway.
And it's hard to note down so much content on mobile that you won't be able to retype it back on a proper computer under 5 minutes.
And it's hard to note down so much content on mobile that you won't be able to retype it back on a proper computer under 5 minutes.