Personally, I'm not a fan of using aftermarket fluids in transmissions, rear differentials, and transfer cases on newer vehicles, but don't think the interval was unreasonable. I probably would have changed it earlier.
As for lubricating brake parts, when I took my purchased-new, S-10 4WD Blazer in for 30k service, one of the front brake calipers had not been sliding freely since new, and the brake pad without the metal warning thingy (sorry for using highly technical terms) had worn down almost to the rotor while the other pad had almost all its original meat. The dealership tried to make me pay out of pocket instead of covering under warranty. Probably not a bad idea to at least make sure the calipers are sliding freely.
Back then, I didn't pay close enough attention to brake pad thickness, but have swung to the other side and bought
this brake pad thickness gauge set, just in case I can't trust my lying eyes when inspecting the brake pads.