New System = New Challenge (Ach/Trophy) Lists?

With the advent of the new systems, why was there a particular need to create a new list with the same trophies/challenges, then offer an upgrade into the new version? I just don't quite understand the option in the first place if it is treated more like a new game, progress is carried, but trophy/achievemt progress is not?

On another similar note, the upgrade nullifies shareable DLC. Not as bothered by that, but just confused as to why it was allowed on current gen systems, but not on new-gen. All I am really asking for is a sense of clarity on both of these situations.

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