This was one of the best "connective tissue" episodes of Star Trek I've ever seen.
It provides context and ties together the Discovery Era "T'Kuvma War" with the eventual outcome in "The Undiscovered Country", while providing a layered, accurate and evocative image of Klingon Honor and "perceived honor" while staying true to the lore and expanding it in meaningful ways. It also has strong shades of "The Siege of AR-558". It now "makes sense" how the Klingons got from TOS to TNG. Wow!
Dr. M'Benga is fast becoming one of my favorite characters. Robert Wisdom's Dak'Rah was terrific too!