This is what Matsuno tweeted. Translation of said tweets is below.

Matsuo: As I mentioned in an interview last year, we omitted Dalmasca because we decided it wasn't a good idea to have the players go through another war story. So, we included something of an epilogue after the Resistance storyline in the form of the Field Notes for some of the characters.

In fact, I played Bozja after its implementation and felt that I had my fill of heavy and tragic war stories (laughs). Also, the war with the empire was part of the 6.0 MSQ, so I thought that would be enough.

In light of the reaction to Save the Queen in patches 5.35 and 5.45, I decided that a Dalmasca chapter set on the battlefield would be unnecessary. Since the 5.55 scenario had already been completed and was being prepared for release, I decided to at least describe the events that happened, so I modified the Field Notes.