I have to say, I think that an exclusive "early access" to new builds, even if ostensibly only a last line of defense against showstoppers, is not a good idea. In the best case (no showstoppers) it means locking the paying customer out of the game for a few hours without need. In the worst case it means locking them out even longer (even though the ride would have been a bit rough). But again there is no need to deny access.
While nature of a showstopper can vary it usually means that the software cannot go to production release with this defect unresolved. The impact can vary depending on what the software does and for Elite this might be frequent crashes (recently happened in the Alpha 4 iirc) or a major part of gameplay unavailable (can't dock). This would be quite the problem for a game like this with a large number of players.
So I can see the need for early access for the alpha team and it is now baked into the release process as part of the quality control. I'm also happy that I'll still have a beta that is playable with more subtle bugs while the next version is prepared

- yeah, a bit of enlightened self interest there
There is that saying: "Don't play on patch day". One always has the option to refrain from the game for the first few hours after a patch while the wrinkles get ironed out -- but it sholud be a choice. After all, making sure that no show-stopping bugs get out to production is the domain of testing outside of production.
This removes the distinction between alpha and beta status, which might be a better model once the game has gone to production and has proven scaleability and stability.
While you can always "not play" the alternative for some is to go and whinge on the forum at the developers with the sense of entitlement that goes with it. Most people do get what alpha/beta status means in terms of software quality and are the silent majority, but the minority will be very loud.
The distinction between alpha and beta status is mostly software delivery process, but in part this is also about PR: a low quality build that gets out to a large audience sends the wrong message. Have a look at the mixed reactions to the Star Citizen build for PAX for an example where it appears that too much was done too quickly with a fixed deadline fast approaching.
Ian.