I tried Obsidian to build a “second brain”. But eventually just reverted back to notes on my iPad (handwritten) and Vim (markdown) for typed notes.
I actually think Obsidian is a great tool, but I just need something as low friction as possible to quickly jolt something down. Vim and Goodnotes does the trick for me.
I tried it several times and the one thing that got it to stick for me was having a structure to the markdown. I have an AST parser for markdown body grammar and validate the frontmatter. The structure helps me keep things sane and organized because my brain is all over the place. Beyond that, unlike OP I attach these schemas to folders in my vault per schema.
Same, all projects get a .notes folder where plain text goes. Home directory gets a .notes folder also. It helps to have good command over text based search tools.
There was an exception though, where text just didn't cut it, which was a brief period where I was importing vehicles from Japan and needed lots of images, documents and comparisons up on a big digital whiteboard. I used LogSeq for that.
This is a project that's always on my mind that I never take the time to flesh out. I can't put my finger on the scope. I don't know if I want a full, Johnny Decimaled PKM platform for my entire life, or topical, dense information about things that interest me.
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...