I think I finally understand what you mean.
As I am discussing sprint as an extra feature falling in the category of jumping and crouching.
While you think it is useless, because it's basically an increase in speed for 5 seconds without any ways to attack or defend and it gives the oposition a chance to chicken out forcing you to sacrifice attack and you say that rather treating it is an extra movement option like jumping or crouching, it should be removed, since it basically is just a increasement in base movent with severe lmitations.
We differ on these subjects a lot, but I can see sprint implemented on a different way. not lowering the weapons at all, but for instance decreasing accuracy for speed, allowing you to attack, with a minor difference, instead of sacrificing anything at all.
If I look from your side, sprint is silly, useless and pretty dumb, no attackin or defending only speed, while giving you an "illusion" of sprinting, while increasing base speed, has the same effect of speed, but keeps its funcitonality.
Please correct me if I am wrong on this.