This might be an unpopular opinion.
But I don't understand why the ability to create any gear, with any trait, should cost only 25 transmute stones (and no trait stones). Right now, simply just altering the trait of an already existing item costs 50 transmute stones. With such a low cost, wouldn't this new system make the current transmutation system pointless?
I understand 25 transmute stones is the cost only if you've unlocked every piece of gear from the set. But in my opinion, that "downside" is largely irrelevant because it would only be a matter of time before people get to that point. Part of the fun of this game (and every MMO) is the grind - few things make me as excited as when the last piece of gear I needed finally drops. The reconstruction system will be fun for the first few weeks when people are still collecting gear. But afterwards, a large part of the motivation for doing dungeons, trials, or other content will be almost entirely gone because they can simply "craft" the gear. It'll be a grind for transmute stones. Why spend 20-30 minutes running a dungeon or trial when I can get tier 1 in Cyrodiil campaign and be guaranteed any 2 pieces of a gear set with BiS trait in the same amount of time?
Don't get me wrong - I think the recollection & reconstruction systems are amazing. I can finally clear my bank of the 300 pieces of gear that I saved without worrying about "what if" scenarios.
Sometimes the grind for a single piece of gear is so bad that I don't even feel happy when I finally get it - but rather, "finally, what a **** waste of time". I would love to have the option to avoid those kind of grinds. But I also want the cost to be significant enough that I actually have to think about whether or not it's worth the transmute stones. With a cost of only 25 stones, which is literally half the cost of transmuting an off-trait weapon, the choice is obvious. Getting the weapon you're looking for already requires luck. But you'll also need to roll the right trait to make running the content worth it over simply reconstructing it, because transmuting costs double the amount of stones.
I think a minimum cost of somewhere around 100 transmute stones to reconstruct an item would be much better.