I assumed you were asking what was wrong with the Joplin app, since that is what I was referring to in my post about awful android app. I use and love Obsidian on Linux, MacOS, and Android (tablet and phone). The only thing I don’t like about it along the lines of my original reply to you is that task lists and to-dos aren’t very easy or intuitive from Android. It’s doable, but kinda clunky. So for that type of scenario I’m using Quillpad.
But no, Obsidian app on Android is great. Joplin…nope. :)