I think you are missing the point - there's obviously a lot more apps that can do more than Evernote in certain areas - e.g. Outlook OneNote - this integrates even better with Outlook. I could use a pad of paper instead of Evernote in the first place. However, the whole reason I use Evernote is that it made my life easier - so if another app comes along that can do what they do and also lets me put reminders on notes then this app is going to be more useful to me than Evernote. As a developer, I highly doubt the reason is technical difficulty, or cost for that matter. I believe it is just a case of a product not listening to it's users.