I agree this is annoying—but isn't it par for the course? OneDrive does the same thing. Is Dropbox better?

The thing that really annoyed me was that SyncThing synced .DS_Store files, leading to tons of unnecessary transfers and conflicts. They could be excluded via ignore patterns, but those patterns needed to be added to every folder—there was no global option. To fix this, I had to edit the code and create my own custom SyncThing build.