I use scrivener!
I’m not sure it’s future proof though. You can (and I do) export projects to rtf files to save in case the software and/or the firm goes poof … but it’s arguably not as portable as markdown with Obsdian
But! The reason I stick with Scrivener is I’m a non fiction writer — while researching a book I might take 2 million words of notes, in thousands of note-files. While writing, speedy search is crucial …
… and Scrivener’s search is LIGHTNING fast