I sometimes write to document my thoughts - but just as often I write in order to discover what I think. Sometimes it's like the writing is the thinking.

Also, I love Obsidian. It became more useful when learned to stop overdoing it with exploring the endless plugin options, settled on a favorite few, and now mostly write in the daily note, occasionally extracting things to dedicated devnotes which in turn have chronological timestamped entries (and bidirectional links to the corresponding DNs). Highest possible recommendation to find a tool / workflow that suits you, and leverage it.