Leg and shoulder armor descriptions are strangely lacking

It’s extremely minor, I know, but it’s strange when even symbols have descriptions (Chibi Arbiter: Wort. Wort never changes), but knee pads say “Supplemental leg armor” in most cases, and shoulder pads say “Supplemental deltoid/shoulder armor” for every single Mk VII shoulder pad.

Like, why were the individual pieces developed? Surely there must be some reason to have differently shapes and sizes of armor pieces. Better if there’s a cool lore description. Part of the cool part of Reach’s armor system was that each piece was developed with a purpose. There doesn’t seem to be any reason for any Spartan to use any shoulder or knee padding over another aside from how cool it looks, which is fine and dandy for us players but doesn’t really make any sense from a lore perspective.

Obviously it’s minor, but it’s weird and stands out. Hell, even visor colors have more description.