I echo the interest in a task API (and have filed a feature request). My biggest driver is the task functionality doesn't have all the features I need. Love creating a task in the context of a note, but need better ability to manage, prioritize and organize tasks. Am looking to pull tasks from Evernote, Trello and Hubspot into TickTick for easy ability to consolidate and manage personal tasks.
While there have been some improvements to display of tasks, it's still a second class citizen in Evernote, relative to notes - one of the reasons to quickly move task flow to an purpose built app for me.