Despite the unfortunate reason for the limitation, as long as the author intends to present a fictional story I think allegorical stories about injustice actually do more to convey the message. There's a lot of fiction that just feels like the writer had tunnel vision on a contemporary issue and forgot to flesh out enough of a story to make it feel like more than a thinly-veiled lecture. Even when I agree wholeheartedly with the message, it can be agonizing to watch.

Just a general thought though, Peele is a good enough creator that I don't expect him to fall into that trap.