I thought all this got started by hydraulic oil in a tranny. If the oil has the right properties for use in an automatic tranny then carry on.Actually, it DOES apply. The assertion that the OP was really making, is that none of us are lube engineers (or engine, engineers), yet you got every Tom, Dick and Harry, telling themselves stories about how they've rationalized all manners of arbitrary concoctions as being a "solution" for their particular engine/trans -whatever....were there wasn't actually, a problem that needed solving. And this ain't limited to this here forum! It's on the 'Vette forums, EVERY forum...and it's in the OP's shop...I get it from mechanics in my own shop(s). That was the OP's original point, regardless of what examples he used, and I agree with that point.
Now, conversely, ALL (engine) oils today are better than good enough. I bet many of us have realized pretty astonishing engine life by doing good PM's, right? I sold a GMT400 with 300,000 miles that ran mint. The cab was rotted through above the windshield, repaired and rotting through again. 5th gear slid on the counter shaft and was rubbing the trans case. The 10 bolt had been replaced 4 times. So, what oil/brew/concoction should I have used, to get "better life" out of that truck? It doesn't matter. Use the bottle that appeals to your particular fancy, and then change it when it's time. I'm sure I'm preaching to the choir on this second point.
It has to have the proper viscosity to flow properly.
It has to have the proper lubricity for the bearings.
It has to have anti-foaming additives to prevent air in the system.
It has to have additives to allow the clutches to hold.
It shouldn't have additives that will eat the seals.
It doesn't have to have red dye in it.
Did I miss anything?
If you think you need to use something different than actual tranny fluid then you better research it well or pay the price.
Personally I would put nothing but designated tranny fluid in my tranny because I am pretty sure it has all the right stuff in it. Good ol type A then Dexron,II,III has served me well for over 40yrs,no need to reinvent the wheel now.