This goes hand in hand with Endless Ranks of the Dead, which creates X Zombie tokens each turn at the start of its own upkeep, where X is half of the Zombies controlled
If they use Starbirth to search for a game-changing Supporter card, they can also make use of it that same turn if they havent used a Supporter already
This rule was clearly added to prevent players from gaining too much advantage in having more resources in hand than the other players, and so this rule can often be seen as a downside since you are losing cards due to a simple yet sometimes unavoidable rule
Originally, enchantments would stick around no matter what until they were removed, similar to artifacts
Returning Mechanic: Quest Counters Many people in the wasteland are searching for something, be it knowledge, justice, or Nuka-Cola memorabilia