I would still not advocate it, as this is not DEVONthink’s focus nor its forte.
DAM is a very specific thing, and while you can do all manner of things with DEVONthink you’ll have to assume the heavy lifting for yourself. If you’re game, go for it. However, a real DAM application would do it better and faster… and with a more focused approach.
PS: Even though DT3 is more powerful and extensible, it is still not trying to be ”all things to all people”. The focus is still the same, text-based data and information - organizing and connection.