Have you performed a survey? My intuition, from my own experience, is that most people are completely ignorant of the symbolism of cargo pants and use them solely for the cargo feature.
I wear Eddie Bauer "Guide Pro" pants. I recommend them, mostly. I haven't found more stylish cargo pants. https://www.eddiebauer.com/p/12951063/men-s-guide-pro-pants
Note, this is just my impression. Maybe there are people out there who just really hate extra pockets.
Everything is a statement, the lack of intention can be doubly so. There are entire utilitarian schools of thought in fashion just like there is in everything else.
Also fashion doesn't exist solely to please others! I wouldn't dismiss an entire massive industry as inane. Vanity is a big part of it like a lot of other things, but if you're making a conscious choice in what you wear... fashion is playing some small role.