I agree. I just flushed mine after about 50K miles of severe use (with a transmission cooler). Off road use, several towing trips (some near capacity), cross country trips, driving too fast when not towing, and etc.Most manufacturers have now gone to what is known as a "sealed tranny". What this really means is that they removed the dipstick. They did this for several reasons including ease of assembly on the line, cost savings of the part itself, but most importantly taking away the dipstick means you have to go to the dealer for any transmission service because you can't check your own fluid anymore. In the old days, sales profits ran the dealership and service was a necessary evil. Nowadays sales profits are not enough to keep the ship afloat and the service department profits are needed more than ever. thus the dipstick disappeared.
As far as lifetime fluid is concerned, if you read the fine print, lifetime fluid needs to be changed under severe conditions. If you use your truck at all off-road, you are operating under severe conditions. I have worked in the transmission industry for over 50 years and if I have learned one thing about transmission longevity it's this. Changing your fluid on a regular basis is the key to a real lifetime transmission.
The fluid needed to be changed (dark cherry color), but was not burnt. Took 11 quarts to get a nice new color. I also dropped the pan and changed the strainer & cleaned the magnets.
I would not want to go a 'lifetime' without changing it.