Originally posted by Weaver:

You can make constructive criticism on the games discord just fine and be considered a good community member. You cannot be a toxic screaming twit raging with comments like "lulz, lazy devs took money and run! Dumb fanboys! Trash!" and such. Remain civil and constructive and critism is welcome. Being rude and such isn't allowed even by those who are supportive of the devs.

The point of a test branch is to figure out how a community will react to changes in a game, before they are released. If the only people allowed access to the test branch are those who:

a) bother to join the discord.
b) bother to be active in it.
c) and are hand picked for being "good community members"

you are going to have a very narrow and specific sample set. If you open it up, that will change.

Does this fact mean I am a super fan of toxic people? No. If however you want to know how the player base is going to react to things, you have to interact with the actual player base. Not a curated selection from among it's most passionate supporters.