I think the level of challenge is where it needs to be, no new purple patches no new nerfs.
The last DD trial I was on was a full league disaster once we got to the sentinel, I told the league leader we didn't have supports but they erroneously thought incarnate destinies would some how be enough, (they weren't)
We didn't have the DPS to beat him with 1 team working on adds and we didn't have defenders, corrupter or controllers (but we had 5 or 6 blasters) to keep the squishies alive during the combined assault of the sentinel & adds so we failed rather miserably to my own credit I managed to stay alive through that hell in that hellish place until the trial failure killed everyone,
*I was on my Bots/Traps and I had already been on a successful DD on my Time/Sonic kind of wish I had been on the latter for this trial.