And in my book, that's Boy-Done-Good. The perfect way to deal with it. At 80K that fluid would be getting tired, but likely still OKish. You flushed it about right. Being objective, left alone, you might well have got away with it too... it is possible.
The guy that gets 250,000 out of his fluid and engine oil, twice over, will be along in a mo'. Speak to Lakes of Wyboston and why many of those cars are on the pile, not all are there with Trans issues, just a lot of them. For the rest of us, fluid looks cheaper