I'd like to chime in on my recent drain interval on such a hotly debate. YMMV, and I would think twice about changing fluid if you are in the higher mielage and do not know the previous mechanical history

At 75K, this would probably be my 3rd fluid change - maybe even 4th. Too lazy to look at my records...Fluid is CHEAP to me. I have done 1 drain bolt as well as a a pan drop. At 75K, I just did another drain bolt. I was having some weird noticeable slight lag issues upshifts to 3rd gear. It's not a placebo effect but refreshed fluid did make that go all go away FWIW.