Just about any game, bust most especially an MMO, requires a Quality Assurance team in order to test new updates, test bugs on in-house servers, and also test live servers behind closed doors.
The QA team would also normally be the ones doing alpha testing - that isn't typically something the general public will have any kind of involvement with.
Whether or not FD have any actual hired QA staff, what they have effectively done with ED is replace a paid QA team with a paying Alpha player base.
All the jobs a QA team would need to be doing, including spending a couple of hours on the server to test a big build, still needs to be done.
It doesn't matter that if it's a beta build, the QA team would still be used to ensure it's stable enough to release. It obviously doesn't benefit anyone if the beta process is effectively switched off due to a critical bug that could otherwise have been prevented by an hour or 2 of testing.
I really don't see why you guys are failing to understand this.
Alpha backers are ED's un-paid QA team.
The irony is that it's the Alphas who probably have a valid reason to complain.