I don't thing the OP understands 'game development'. (Sorry I couldn't resist, some will know what I mean and that line was absolutely sarcasm for the rest).
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This Beta it was announced that all would have access to it at some point for no cost, so part of the OP's objection is muted. In fact I thought as I read it he was going to say, hey some of us paid to be in the beta and now you will let everyone into it at no cost? Why did I pay for it then? That actually would be a better point then the one he is making. Personally I like the idea early Beta testers and if enough new content or as they suggested this time enough base code changed they need a wider audience go for it. However not all new content needs to be seen or tested by all or none. I have done other beta's where new content was not shown to all.
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Let me give a couple Beta examples, I Beta tested Everquest multiple time, I was in a raiding guild. We won for years all the major raids but not once was I able to beta test the guild raids. Now the beta's for Everquest were free, well unless you remember that a 2 year subscription cost US $200 then in a way I paid for it. So new content, I was beta testing, I knew the raids would be in, yet did I test them or anyone I know in Beta's? Nope did not happen. So I am sorry to say to the OP not all Beta's show everything. In fact if you don't raid in Everquest you may never see the content you bought in beta or on the 'live' servers of the game. His point is null and void because beta isn't actually testing all new content, it is testing all the content that the developers want tested and have questions about. Sorry OP but a beta is not testing everything new but it is needed to test everything the developer wants tested not what you want. In fact FD could have pushed the Beta out, and never mentioned that the Thargoids portion would not be tested. They could have said, remember how they appeared for the first time months ago? Was that pre-tested? How about them on the planet and coming down, or the Thargoid structures and the star map? Never was in a beta and by your reasoning should not be in the game as never beta tested.
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Not all content needs beta testing, sorry to burst your bubble, but beta testing is to test what the devs need testing not what you want to test. A huge difference.
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Calebe