I suggest that borders between columns are redundant and should be removed.
Columns are by their nature delineated regions. The use of borders around columns provides explicit delineation. But … When multiple columns are left-jusified against one another, the delineation from one column to the next is often already “self-evident”. The borders become redundant “fluff”.
The app Papers3 shows column views without explicit border lines. The columns are offset slightly from one another to provide additional clarity of the implicit delineation between them. By comparison, because its columns have borders, one has the impression with DT of needing to “read through/distinguish from border lines” to “see” content. This is especially true because the borders have the same color and color density as some of the text in the columns. Reading content in column views in Papers3 is easier than reading the same in DT.
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JJW