As far as i understood indexing, changes from DT (rearranging in new hierarchies of groups) is not reflected by changes of the folder structure within the original files and folders.
If this is true, your suggestion does simply not apply. At all.
The original folders may, for example, just be giants folders of PDF files and images, without any order, structure or file system hierarchy.
But having them indexed in DT would allow to sort them for projects, people, years, topics and even related tags.
And this hierarchy of groups within DT is what people want to see, access and use from other Apps.
If i still need to access the unordered and unsorted original folders, I don’t need to use DT at all.
The point is to access the new group hierarchy of DT from other Apps.
Like I can do with other Apps on iOS / iPadOS when accessing the DEVONthink document provider in the Files App.
So, finally i am not sure if you misunderstood me, or if I misunderstood you.
The goal, of course, would be to access the DT hierarchy of groups as regular Volume with folders in the Finder, Terminal Apps and any other App.
This was at least the big selling point for me with DTTG.
If i would then only access things within DTTG, the App would be pointless to me.
The same goes for DT: I want to use DT to sort and order things.
But finally, I want to use the sorted content from other Apps.