So follow factory recommendations, but also don't. That's what I get out of your post. RAM says it's a lifetime fill and should never need serviced, yet you say it should be. ZF recommends 60k service but they don't even make the transmissions for RAM. Stellantis bought the license from ZF to manufacturer them right here in the good o USA. So saying you should change fluid and filter is going against manufacturer recommendations.
As for warranty, most people putting aftermarket parts of their vehicles don't care about the warranty anymore. Especially since RAM says there isn't a need for a service interval.
Every aftermarket part install by owners is unnecessary, you may be content just driving your truck from A to B, never changing anything. Some of us like to enjoy our trucks and changing looks and/or performance. I'm lifted with bigger tires, aftermarket HD axles, 35" tires, off-road bumpers and winch, custom vinyl...............stock is boring. I'm outside warranty, not that I ever really cared before. As most of the stuff I did to the truck was while it was under warranty, and never had any issues getting warranty work done. Keep your truck stock, don't worry about us guys who like to modify ours and actually research parts. There are more bonuses to going with the PPE pan, than keeping it stock. But you need to actually use your truck, not just commute with it.