Picking up from @korm, I have several entire Obsidian vaults indexed on MacOS into DT. It works well. Why? Because I preferred the Obsidian interface/workspace on IOS iPad for my recipe vault rather than the corresponding recipe group in DTTG.
I avoid duplication on IOS so where I have an Obsidian vault I don’t synchronise that database with DTTG (All my vault indexed groups tend to be in their own databases in DT so I can pick and choose what to sync). For example; I have a cookbook database, a diary database…all with corresponding indexed groups to a vault)