I don't really mind this way of doing it since I know that my data is "safe". I can at any time just grab my vault and open it in any editor. I can write my own editor. I can import the data into most other tools. It's when the data isn't open that I tend to avoid the product.

Exactly this. Conversely, most open source apps on android might as well be closed source with regards to your practical ability to export your data unless you use a ROM that gives you some form of root access (such as adb root).