While these discussions between devs and players is very interesting, there are very many players who cannot contribute. With all the possible combinations of professions, specialisations, trait choices, weapon choices, rune and sigil choices, there are incredibly many ways to make totally useless builds for any character. The way most players make builds is by copying what someone else suggests, not by understanding how anything works, or what the aims of a build are. And having done that they have a build that can get them so far without them having learned anything.
So what I think would help the most is if the devs could give explanations of what players should and should not be trying to do with their builds. Things such as telling us which attributes are important to which specialisations for the particular play styles that are now mentioned in this new document, and which attributes are not useful to those play styles. People could then start to understand how to aim for a particular set of attributes, rather than where to find a pre-made build. With this kind of learning, I think many players would not only be more effective in their chosen roles, but happier too, because understanding more about what they're doing gives more satisfaction than button mashing on a pre-made build without even knowing what cues they're trying to react to from their opponents skills.
The lack of player understanding is why Anet needs to provide possible 'easy' builds for each specialisation. (And I'm sure we all love to play easy builds at least some of the time.) But to get more players more deeply involved (for instance in raids, fractals, or PvP,) players need to feel they're learning more about why and how more complicated builds work better.
The choice of attributes, and ability to select from very many choices in a build is attractive, but since different specialisations have different strengths and 'holes', we need to start off by learning what that means in terms of recommended attributes, and attribute balances and trade-offs.