They were definitely worth the effort before if you were specifically going for the Mysterious Chests. Now those have been boosted in cost, it may be less worthwhile.
That being said, uniques can now drop from Helltide chests, and drop rates for non-Mysterious chests have been increased so it might be a zero-sum change.
With the removal of the Tidal API from Plexamp, I will be sorely missing my discovery recommendations. Will need to give this a shot using Last.fm scrobbling (already supported in Plex).