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I mean: you save half an effort.

You edited a file on iPad (everything was synced before), now you have to:
1. iPad: upload it to webdav
2. Mac: mount your webdav folder
3. Mac: make local copy of file
... Mac: editing ...
4. Mac: upload to webdav (you have to remember this, you never know when you will need your file on iPad)
... Mac: editing (after few days) ...
5. Mac: upload to webdav (again, you never know when you'll need it)
6. iPad: download file from WebDav

With DropBox/DavDrop you don't have steps 2,3,4,5 - you simply edit your file from your HDD.

Much simplier to me.