If you haven't tried Obsidian at all I think you should give it a shot and write notes without following any system in particular. If you've tried it and you still prefer paper notes and the occasional apple note, then perhaps Obsidian isn't necessary for the way you take and organize notes.
My handwriting has degraded from consistent keyboard use over the last 30 years. Obisidan has replaced my paper notebooks, mostly because of this. However, it is handy to be able to mesh those notes with hyperlinks, LLM output snippets, quotes from other sources, embedded images, etc. Doing all of those other things would be laborious to impossible with paper.
What I also really like about notetaking apps is that I can organize my notes hierarchically, move things around and make cross references.
I still regularly sketch ideas on paper, but once I have something that's worth keeping, I write it down in Obsidian.
I'm also skeptical about this "Second Brain" thing. People make videos on YT about how they have been enlightened by Obsidian and then try to sell you their online course. To me it seems like notetaking for its own sake. You could call it "idea maxxing" :)
We're all becoming mental hoarders and discussing our piles of though junk in our digital storage units.
IMO it's way better to do what you think is good, whether that's Obsidian, notebooks, or something else