It seems once you accumulate enough echos to cause it to switch to choosing only random echos, none of the additional ones (that you have to scroll to see) seem to be applied. I noticed this yesterday when doing a run, i obtained a random echo that caused enemies to explode on death and apply 60% damage to enemies around them, but it doesn’t trigger. I’ve also gotten elemental damage applied through this process, like heat or cold, but nothing changes.
Also, I’ve added some health regen to my gear, and I’ve picked up health regen echos in the crucible, but neither of them seem to be working in or out of combat.