They want to see which people are able to articulate their words so well that they can fully answer the prompts in the most concise way possible
I know, it sucks, because I always want to write a lot too, but there's more skill in being ablt to answer an entire prompt in 600 words and be extremely concise than there is answering the same prompt in 3 pages
You're smart, you know what you're talking about, they'll recognize that.