it improved the reliability, that's for sure. Doesn't mean immersion got improved. Look at your starglobe; it contains more than 6 cards. Whether you re-draw, mulligan, or shuffle your cards with a deck that contains duplicates, there's a chance to draw the same card - Chances of may differ depending on the action.
The change is both good and bad. Good because SE is listening to the players and actually catered to them by changing an ability for sake of (slightly) improved reliability. It's also bad as it doesn't make sense as your deck contains duplicates of the same type. Inb4 any arguments: If you spread a card, you shouldn't be able to draw that card ever again till you use the card spread. But you do.