As I said, you clearly communicated that they are in place (in large part) to even out the playing field.
That's also why team success plays such a huge role -- yes, I know ratings are #1. But postseason success plays an exponentially larger role in HD than it does in real life, which is line with your above comments and further shows why the most successful teams are being targeted for early entries.
If you look at real life mock drafts before and after the NT, there is barely a change. Maybe a couple guys step up each season and put themselves on the map, but of course that's different as well because it's about their personal performance, not their team's. In HD, I've had guys leave early after a deep run despite shooting 34% from the field for the NT! In real life, almost all of the guys that leave were doing so before the NT even started.
But in HD we all know that the farther our team goes in the NT, the higher the likelihood we'll get hit w. early entries, regardless of how the actual player performed, lol.