I don't want to be restricted in how I am taking down information. Sometimes, I want to draw on a tablet, sometimes I want to write markdown, sometimes I want to do workflowy style outlining.
I shouldn't be restricted in that way!
So far, the only one I've been able to settle on for about 1.5 years now is Obsidian.
But I can also relate to never wanting to stick to one system for second-brain work indefinitely.
I've made the mistake of trying to build my own second-brains more than I probably should.
BTW @genghisjahn given your tool usage I'd love to get your thoughts on BrainTool (which I've been pimping throughout this thread!) Since most of my inflow and things I need to keep track of come via browser and most of my notes are in orgmode text, BrainTool is the thing I built to bridge the two. I'm hoping its a more generally useful lightweight organizational tool which doesn't require the maintenance of other solutions and have been gathering informed feedback wherever I can.