They closed the mobile app to new downloads, which I understand for how poorly it performed. Thankfully, the main contributors to Boostnote posted back in July that they intend on re-releasing an updated and rewritten app. https://github.com/BoostIO/boostnote-mobile

Outside of the app, I agree with your list, but now consider Markdown to be a need as opposed a nice-to-have as well. Frankly, most of the things that you suggested should be table stakes for any note app moving forward. I’m not sure how I feel about folders as a need anymore, as I’m trying to get better at treating notes like email: rather than sorting them into folders I rely on search to surface things now, saving lots of time in the sorting process (when they can’t be filtered automatically, that is).

I’ve actually been looking back into Simplenote after a demo of some new features that I got last week from one of the maintainers. It’s gotten better about import/export as well as Markdown support. So far it’s feeling a bit better to me than it has in the past. I was so frustrated with these tools when it came to import/export functionality, I kind of want to write a “universal” tool to transfer data between various note systems.