I agree! The production is kinda bit recycled though considering Greg Kurstin...its sonically similar to Kelly Clarksons Let Your Tears Fall and the production in the bridge borrows subtle elements from Beyonce Standing on the Sun, both of which are Kurstin co wrotes & productions.
Let Your Tears Fall slays One of the best songs off Piece by Piece
Water Under the Bridge recording was literally done in the middle of October of 2015..It was before the MTV European Awards rehearsal according to Jess Glynne whom she have heard Adele recording the track. Like just weeks before the final mixing.