Here's the result of copying and pasting the content of a date field (Focus is on the field in the grid, and I press Ctrl+C):
To copy the content, 1- I need to select the cell, 2- press F2, 3- select the content , 4- then copy... 4 steps instead of 2 short ones.
Otherwise, if ou select a bunch of same level items, but they're lower in the hierarchy, you can't paste them back easily without first removing the tabs. (I actually wonder if there are cases where keeping the tabs in an "absolute" way would always be handy.)
So, e.g. if you select 5 items at the same level but at the 3rd level of a hierarchy (not included in the copy paste), and paste them back somewhere, they should be pasted exactly where they are pasted... at the first level if that's where they are pasted, elsewhere if not; but not after 3 tabs because they were originally at the 3rd level.