My own contributions are probably a sense of humor, a lifelong love of the stage, and the experience of having written so much accompanied vocal music, even though Tartuffe was my first opera. These composers found ways to successfully marry text and music, just as I believe you have. I compared their librettos with the plays and tried to understand all the differences. Yes, Mozart, Rossini and Verdi are among my favorite opera composers. That is a meaningless word.
All successful music is eclectic.
Every composer stands on the shoulders of his or her predecessors. Tartuffe, of course, deliberately parodies, satirizes, burlesques and even quotes other works and styles, so the best answer to that critic would be Brahms's answer to the critic who said that the great melody in the 4th movement of his First Symphony greatly resembles the melody in the 4th movement of Beethoven's 9th. I used the same tune I wrote as a student, though all the fa la las and the accompaniment were added. I wrote the tune more than thirty years before I wrote the opera.