I accidentally deleted my reply so here it is again!
I’m finding Obsidian a great Devonthink replacement.
I have the ‘all file type’ sync option enabled, on desktop and mobile, and use attachments in Obsidian and files in assets folders. I’ve mainly used PDFs and images so far.
It took a while to create notes for some of the files, but i did this in a few days. I can access them on mobile and desktop and all my attachments are in folders on my iCloud, which I much prefer to proprietary databases.
I had attachments in both Devonthink (imported) and Craft before and finding attachments became a chore. I’d often forget which app I’d put them in and had to deal with the apps to search and then export the attachments.
Now, I can use Alfred to search for and in files, and I find this much quicker. Having the notes as plain text files means I can also use apps and scripts to do quick batch processing, for example find and replace and renaming. I’ve used this a lot to prune and rename my notes and attachments.
The biggest benefit is the linking of all my notes and ideas in one place. I can see links between my notes, journal, daily notes, meetings and projects and it helps a lot. I’m finding this really helps in generating ideas and local graphs are really helping me with research and brainstorming.