Echoing Truth has found its way back into the sideboards and our hearts as the card to answer things like multiple Chalice of the Void, Chancellor of the Annex, Leyline of Sanctity, or even Marit Lage. Its versatility is why it's seeing play over a card like Hurkyl's Recall, being able to come in for a variety of different match-ups is highly desirable when playing a silver-bullet "wish board."
With decks such a Dragon Stompy being popular, Echoing Truth makes a lot of sense as it is easy to cast is a big difference maker compared to having to sideboard in something like Abrupt Decay. Having the ability to cast your solutions to permanents off of basics makes life much easier. Which is why you'll see bounce spells in today's metagame, especially with Counterbalance being not as popular as it once was.