REQ system

How does the REQ system fit into the lore? It just seems kind of dumb. The packs don’t make sense. “We don’t let you choose what armor you get based on skill. Instead, we put everyone into a lottery. Eventually we’ll all have armor designed for sniping, even if you specialize in close quarters.”

UNSC: “You get to have more tanks!”
Spartan: “Why?”
UNSC: “You got really lucky!”
Spartan: “But what if I’m bad with tanks? What if I wanted to use something that can fly?”
UNSC: “TOO BAD! You’re going to get tanks and you’re going to like it!”