@ZOS_Kevin , I hope you're watching the various threads on the Endless Archive, and putting a report together for the Team on players' feedback - which is pretty similar to that on the PTS forum.
Veterans find it too easy, casuals find it too hard, nobody likes the limited lives and the absence of any save or checkpoint facility. The randomness factor with bosses is creating some very strange outcomes, such as one-shot mechanics from higher trial bosses in Arc One, for example. The rewards are fairly disappointing for the amount of effort needed. Those seem to be the major concerns.
It would be really useful if you could please confirm what "the intended audience" specifically mentioned in a PTS patch note actually is.
It would also be very informative to all of us if in a week or so's time ZOS published some stats from the data logs. We don't need to know how many players tried the Endless Archive but out of those who did so in that period, what percentage completed each Arc? How does that compare with your original expectations?