Your points sound valid based on chemistry, so I'll take your word for it...
Mike miller solely writes those recommendations for those that take the long view on ownership.
With that in mind his 270,000+ miles on the original 3.0 cs engine in my book does give him a level of credibility. Do I agree with 2 year coolant changes, 1 year brake fluid, and 60k mile spark plug (although valve cover leaks is a solid argument for) recommendations? No because my similar experience to 300k miles on multiple cars from new has proven that as unnecessary...but...everything else he says is nearly identical to my proven maintenance areas...I would argue he suggests UNDER maintaining auto transmissions/differentials and transfer case.
My sole point here is...there is nothing wrong with over maintaining if your view point is well past 100k miles of ownership.
Otherwise your are 100% right what's the point of following his advise as it is just over maintaining.