Yeah that makes sense. The power steering fluid is like chocolate milkOne thing to keep in mind with filtered fluids is that no matter how clean you keep the fluid, some oil additives will be consumed over time. Obviously, the clean fluid will help, but it should not preclude regular fluid changes. I'd be more inclined to change out the trans fluid on a regular basis (which could not be easier) and add a filter to the return side of the power steering system which is harder to drain and re-fill.
I had Valvoline Semi-Synthetic High Mileage ATF in my truck before some case and clutch work, which seemed to smooth my shifts out and quiet the beast just slightly. After the work, I have the shop supplied ATF (cheapest stuff most likely) in there now and its back to tough shifts into second gear and general noise. I'll go to a Redline or Mobil 1 ATF soon, but after a few needed repairs.
I plan on flushing that along with my brake fluid also.
Now about the fluid...you recommend Redline or Mobile 1 over Mororcraft Mercon V from the dealer ?