Precendent: an earlier event or action that is regarded as an example or guide to be considered in subsequent similar circumstances.
People don't seem to realise that Blizzard are builds ahead of beta with balance changes, they are just farming data for now. Class balance is irrelevant until S1 starts
And yet, here we are, xpac after xpac, when systems and (some)classes are released in a half decent state.
To continuously argue that such things are solved at a later date is just giving a pass that they shouldn't get in the first place when beta testers consistently report on their respective classes' issues.