The export csv function is great, and the UI for tracking habits per day is great, but it would be more useful if it was possible to see/analyse all habits and it really feels like that is missing. csv export is likely the simplest and most flexible way to allow this. I would personally prefer it to a UI overview anyway, or at least have a higher priority for it, so I could have control over how to analyse and visualise my data. And it's likely that different people will have difference preferences for how to see their data anyway.