Well this new Proving of Worthiness system certainly has proven to be interesting. But about the Deckbuilding Task...
It was a probably a good move extending the range of deck threads to the rest of the Deck Ideas board as opposed to just Deck Help like last Trials, but there's a negative side effect that I feel needs mentioned.
As opposed to Deck Help where people actually expect people to improve their decks and give them constructive criticism, the remainder of the Deck Ideas board allows people to submit their decks in what to them feels a finalized form. Granted, it's not uncommon for you to see people who do want suggestions to their decks, there are those who expect people to just use their deck and not tell them to completely change it since they've tested it a fair amount before posting it. Now, because people are required to give 200 words of feedback in addition to a deck image, this practically demands that they change some aspect of the deck in a drastic manner or else they're going to end up spending the next wall of text discussing why they changed Pends to Pillars or added 2 Flying Weapons to the deck. Then there's the complication with having so many participants commenting on the same decks. You naturally don't want to find yourself in a position where you wait too long to comment on a deck because there's a chance that people might go crazy and take all the decks that you think actually need a major improvement. As a result, less time is spent focusing on the quality of a deck submission and instead a participant can be expected to comment on as many decks as possible in the shortest amount of time.
With a combination of the factors I discussed above, there's a distinct possibility of these thread creators (or even other random forum members) responding harshly or negatively to the Trials post and its poster, which seems to be the opposite of what is desired from this task. When this Phase is over you'll be able to see just what percentage of users didn't appreciate the criticism given to their decks.