@Eghizio thanks for highlighting these. I’ve moved your specific notes on the stage to Question about Handle APIVersions requests stage - #3 by rohitpaulk, will address there!
I’m a little bit confused. If this “challenge” is about guessing what to do then that doesn’t seem that much fun and challenging at all.
There’s no guessing here - the challenge is to re-implement Kafka. We just don’t have a friendly re-interpretation of Kafka docs like we have for the previous stages (yet). We’ve added tester notes so that it’s clear what exact tests you need to pass. Our tests are run against an official Kafka server to ensure that they’re valid.
I think it is better to release something a little bit more polished than to beta test on users:
The challenge is marked as beta for a reason 
This is our style – we release early and often. If you’re looking for a more polished experience, I’d recommend checking out our other challenges that have been around for a while, like Redis.