Earlier quoted context omitted.
Being native isn't everything. As I mention in the readme I couldn't find an app that ticked all the boxes I'm interested in, which are: notes are written and rendered in GitHub-flavored Markdown, no WYSIWYG, no proprietary formats, I can run a search & replace across all notes, notes support attachments, the app isn't bloated, the app has a pretty interface, tags are indefinitely nestable and can import Evernote not…
I feel you on this, but for me the solution has been really simple so far: just a dedicated notes folder + good ol' atom. Ticks all the boxes & uses nothing but my default workspace
Markdown already handles 'attachments' via tag for image or HTML anchor for other file types. Prettify via CSS.
Global search and replace indeed needs an extra effort. If faced with such a need, I'd just use any of active IDEs already installed, well, Atom should do.