On a Gen 5 camry, the transmission fluid dipstick says the fluid doesn't need to be changed under normal driving conditions, but that doesn't stop people from changing it, and claiming toyota is out to get them via planned obsolescence. Also, "life of the vehicle" is understandably undefined because lawyers exists.
So, later, toyota just removed the dipstick altogether, and made it REALLY hard to check/change -- "No, really guys, you don't need to change this fluid!" And of course, we'll change it anyway, because, "We don't believe you, toyota!"
I have to admit, I wanted to believe the sticker too, but hive mentality settled in, and I decided to change it anyway on my 02. Doesn't really matter though, the original fluid really would have lasted the life of the vehicle, which for me was around 125k miles, when the 2AZ-FE engine died a stripped head bolt death (I had it brought back to life, but that's a different story).
Next generation transmission: Toyota, are you listening? Just weld the transmission shut with a sticker that reads, "NO MEANS NO!" ... Then again, we we probably just drill and tap our own service holes in it to change the fluid.