Hello, KabiKabi! It is true that access to playing on the test server is given only to content creators. So if you happen to launch a YouTube channel we will be happy to see your submission to become a content creator.

As regards an opportunity to test run any Mech Arena Weapon or Mech before adding it to the Inventory - this is something that is being considered for the future.

I'm sure you've heard this before, but your "test server" isn't a real test server. Partly because it's for content creators only. Another part is you only let them "test" it the day before release when it's already in the game and no significant changes are planned. The "testers" on the test server don't give feedback on items for the devs to make changes. It's a glorified playground to show off the next piece of shit for whales to purchase.