I'm old school. I've been working on cars since I was old enough to hold a wrench. Back then, 30k miles was the recommended trans fluid/filter change interval. And 3k miles was the interval for oil/filter, which I still adhere to. I can't in good conscience let a car, I don't care how new or well made it is or what the manual says, go 150k miles without a trans fluid change. It just seems...wrong...
Its not 1970 anymore.
Things modernize and change. 30K was the interval at the time but now things are designed for higher intervals. At 5K intervals when i change the oil in my LS it looks the same as it did when i put it in.