Obsidian is amazing on my desktop environments but I shared the same sentiment with you, on mobile I use Apple Notes and transpose to Obsidian if its worth doing so...
I like the desktop app, but the android app is such ass. It's bad enough that I wonder why they even bother.
Similar to mine. I use Apple Notes for quick, ephemeral notes and for Shared Family Notes. If they are the ones that are more important, they go into the plain-text notes in the Obsidian folder.
The Notes folder(s) is sync with a Cloud Service. So, I use iA Writer[1] (a brilliant Notes App) to have a pleasant writing experience on other mobile devices. They are just Markdown, so I can open them in any Notes App that supports Markdown. I paid for iA Writer once, like 10+ years ago.
1. https://ia.net/writer