There was a point where I had most of my work and ideas in Devonthink. Then I noticed that a few important files had somehow vanished. I don’t know for sure if this was due to the software, but it unnerved me, and I moved to Obsidian.
I used DT primarily as a knowledgebase/notes app; I never found its smart features to be particularly useful. Nowadays, I’d definitely recommend Notion over DT.