To each their own. Here are my observations from changing fluids in my (new to me) 2014 with 132k miles :
Coolant : Original "gold" coolant looked destroyed. It was turning brown and had gummy/sticky floaties in it. Flushed / replaced with Prestone green OAT coolant.
Power steering : Fluid was dark brown and looked nasty. Replacement fluid (Mercon LV) is bright red.
Brake fluid : Fluid in reservoir looked clean and had a slightly orange tint. If I knew it was in such good condition, I wouldn't have changed it (synthetic DOT 4 type).
Front diff : Fluid was dark gray color and smelled pretty bad. It looked like it was full of microscopic gray particles. It wasn't burnt though, just very dirty with metallic sludge. Fluid changed for 75W90 synthetic and a magnetic fill plug was installed to reduce future contamination (not factory equipped).
Transmission : Fluid / filter did not appear to have ever been changed. Fluid was dark red in color, but in good condition overall. Fluid filter casing was covered in microscopic metal particles and so was the pan magnet (no large chunks, though). It definitely could've used an earlier fluid/filter change to keep all solenoids happy...
Transfer case : Fluid had been changed in it before, as evidenced by the slightly damaged fill plug. Fluid was nice and bright red. I changed it anyway, just to be safe. Magnetic drain and fill plugs will be installed on next fluid change (not factory equipped).
Rear diff : Hard to tell if fluid was changed, as it was in pretty good condition and slightly greenish in color. The rear diff drain and fill plugs are equipped with magnets though, so that might've kept the fluid cleaner than the front diff. Changed it for new 75W140 synthetic.
So, saying that fluid changes "don't do anything but lighten your wallet" is a bit of an ignorant statement, as these electronically-controlled components are very sensitive to contamination... and clearly, most of these fluids were definitely due for a while.