And why does it look like blackbloc-mixed-with-courier-core for software developers who don't even ride a bike or do anything cool? Like my dudes, just put on the Patagonia puffer like the good PMC Karen you are.
Is it just the opposite version of people who got really into football jerseys or carhart jackets but for people who used to buy Supreme shit?
Is this why hardshells are so fucking expensive now?
Straps are cool.
Aesthetically I think it derives from parachute harnesses, straps used to secure pistol holsters, and other related military gear. There's probably also some influence from trip-hop and bondage pants, which in turn were long ago influenced by medical restraints and related bondage gear.
Straps and dangly bits break up the silhouette of the pants, giving the designer options to change and play with the shape. They create more visual detail or even visual noise and give you places to add buckles, slides, and other shiny bits.