It's simple: because we believe you are capable of ideas that we just haven't considered before.
Think about it:
Sure, with time comes experience, but perspectives are a funny thing. Professionals try to solve problems from their point of view, but they might be ignoring something that would be obvious to you.
We've seen you do some amazing things so far this year; you've devised projects that we never could have imagined and found solutions to complicated problems.