Figaro is so great in so many ways!

I think it's that to me, the Countess's reply moves the entire opera into harmony and resolution, the way it flows into "e tutti contenti," and part of me can't help believing in that.

"Tamino mein/Pamina mein, O welch ein Glück!" is one of my favorite moments in opera too.

I'm glad you like that take on it. It makes sense to me, but my views can sometimes be eccentric.