Personally, I use Drafts 4 when I’m on the go. I have it on my phone, tablet and computer. I take notes there.
And then I made an action that exports the note as a Markdown .md file to Dropbox in my Vault. It uses a YYYY-MM-DD-HH-MM format for the title.
And at the bottom of the note, I include two specific tags, #sent-from-drafts and #UNASSIMILATED. That’s a keyword I wrote about from Robert M Pirsig’s slipbox system. I use it to remember - like an inbox - that I still want to integrate it into my notes. A better title. Linking. Formatting, etc.
The specific app doesn’t matter much though. You just need anything to save text files, temporarily. I’ll even email myself notes sometimes. But having that specific tag lets me send the notes into Obsidian without worrying they’ll cause a mess. Because I can find and clean them up later.