I honestly don't use the mobile app much, but when I tried to use Roam's app in a doctor visit, it was embarrassing to wait 30 seconds for it to load. It was doubly embarrassing when I compulsively closed the app and had to open it again 🙃
I hope you post about your experience experimenting with Obsidian :)
And here's a specific example: https://www.reddit.com/r/autism/comments/146fb4d/downvotes/