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Certainly doesn't solve your problem to know this, though, does it?Of course it does, since now they can click on the date column inside a group, and get the order they want for that group, in addition to the overall grouping into buckets based on date ranges.
>* I for one cannot fathom how this sorting arrangement is of use to anyone, personally ..*
Well, if I just wanted "show everything sorted by date" I could have done it in list view.
Grouped (arrangement) view shows the data in groups. What one might want the grouping to be and what the order to be inside the groups is not necessarily (if ever) the same.
E.g. if I want to look at files of a certain naming scheme that I created last week, I could set to arrange the finder items by date (so I get I nice "past week" group, today group, month group etc) and see the items inside sorted by name.
If I want the items in the groups sorted by date too -- I can just as easily.
If Finder could only use the same column to form groups that it uses to sort inside the group I couldn't do that.
This is the most flexible way -- and analogous to what all and any database systems offer, where group by column is not necessarily the same as the order by column.