Back again.
After 40k (at 47k) on AMSoil, my drainplug had MINIMAL residue on it. The MaxLife shifts are pretty fast and crisp.
All fluids loose their FM qualities over time.
I do like the 1x a year or every other year method. If you are behind on your service, or get a used vehicle, sure do as many D&F as you like. For the guys who use expensive ATFs, on an old under serviced vehicles, I suggest a few changes of cheap ATF (generic ATF+4 or Dex VI) and then settle on your premium fluid.
I don't see the benefit of more than 2 D&F in a clean unit (75% concentration) . Wait and do the subsequent service in a year.
Also, although the extractor is a great tool, the Honda ATF is SO easy to service. The nice thing there is that exactly 3q comes out, 3q goes in, almost no need to measure. Just be sure to have a level surface because it will affect the level. Mostly, less than 3q will not come out, and if you put 3 back in you have an overfill. Just get down there with a 3/8" ratchet with an extension. It is tough to break that bolt the first time, but just don't over tighten and later it's easier than an engine oil change. I slipped a piece of warm 3/4" PVC over my ratchet for an extension.