Just realised how split the community will be when the beta comes out..
There will be the beta tester trying test and find all bugs, whihc will delay the game.
Then there will be the non-testers trying to get the testers to just fly through the DLC forgetting bugs so its released as soon as possible.
Your last sentence is probably why some companies hesitate to release betas, not to mention some people use betas as a representation of the final game, despite the warnings posted in the intro of the beta. What happens in the Dawnguard beta, stays in the Dawnguard Beta! /Vegas