What they should have done with Second Coil:
1. Put in DF fine. But no other changes. People can gear up Poetics and try running it over geared.
2. After a few months, add a non-stacking 10% echo, still with no changes to the raids.
3. If for some reason people are still having problems, then I dunno. Change ONE mechanic only at a time, over a period of several more months.
Especially with new poetics, them making all the changes this soon at once was a big mistake in my opinion.
And yet a lot of people spend a tremendous amount of time on gear that provide zero statistical benefit whatsoever. Glamours.