You’re welcome - that’s what it’a all about 
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In a nutshell! Exactly.
Bearing in mind, though, that I too am relatively new to DT and may have yet to discover ways to integrate - as @pete31 illustrates.
You’re not. And I agree, I think it would be a very good way (for you) to go.
Thanks, @dayknito. That makes it really clear. DT is, I’d say, the single best tool available for the organisation, categorisation, display, and searching/retrieving of data. It excels at allowing you reliably to group, subgoup, tag, label and put your data into the most granular and transparently meaningful hierarchies you’ll ever need.
I’d have said it was infinitely superior to the OneNote + Dropbox + Boxcryptor setup you have been using.
May I suggest that you keep posting here on this forum for best practice and others’ experience of synching (à la Dropbox); and of how to manage individual notes with customizable formatting - especially in list formats, which means DT’s growing support for Markdown.
I can’t help feeling that Obsidian on these last two needs may be a better fit. But Obsidian is not a conventional document management system with the sophistication of DT.
Which is why I’m veering towards thinking that Obsidian with DEVONthink may be your ideal blend.
No. But DT-indexed Obsidian Vaults might. And Scrivener integrates well with DT.
Have you found any system that avoids this?
I can see how that is the ideal. Not sure that DT on its own can do all of that seamlessly. Others will know.
I agree. The apps which created the docs are definitely the best way to edit them. But most of these work so well ‘from’ DEVONthink that I don’t believe you’ll be disappointed. It’s the transparent synching and encrypting that worries me more now.
Not at all!