We had a Honda Accord once. It was having transmission issues. Forget the milage, but it was aged. Honda's stance was "don't ever change transmission fluid - in fact, don't ever open a transmission - it's sealed. If you do, we won't help you". Their position was - by the time your transmission goes, replace it. I thought it was bizarre. Took it to a particular AAMCO a friend takes his dealership cars to (used car dealership). They opened it up and did a rebuild for me. MUCH cheaper than a replacement and it lasted for a while - until we sold it.
I've also heard if you don't change your transmission fluid by the manufacturers recommendation, may as well never do it. If you do, the stuff sitting on the bottom gets sucked up through the transmission as you replace the fluid and it trashes it.
Not everyone lives in the same place, same environment, or even if they do - drive the exact same way under the exact same demand. SO all maintenance recommendations are just that, recommendations. Probably based on ideal conditions. I was not at the recommended spark plug replacement milage but ended up having a broke plug. Being close enough, replaced them all so I wouldn't have to concern myself with it. And - seemed like good advice from 07navi after looking in to it all.