Joplin is cool because you can add your own css to customize the desktop app. I realize not every is interested in doing that, but I’ve been an advocate once I tweaked the styles to my liking [0]. Agree with you that the mobile app styles are very rough, but the community is very active and open to suggestions / improvements [1].

[0] https://github.com/amandamcg/joplin-theme [1] https://discourse.joplinapp.org/

I'm only a week into using it, but check out Notion. I really love it so far. The UI has blown me away in both beauty and how it gets out of the way.