The shortest sync interval is still 5 minutes. But I have developed the habit of CTRL+S'ing after each important change. Which is coincidentally the sync shortcut key within Joplin. So for me that isn't really an issue.

But to be fair, I was looking for a 'real-time' webbased app, like Notion. But I wanted it to be self-hosted, use Markdown for formatting, (a little) polished and easy to setup and maintain. And while Joplin isn't perfect, or even fits all of my criteria, it was a close second. Even if it has it's drawbacks.