I recorded this clip to show that when you get shot while sprinting, it removes you out of the sprinting mode, even with toughness not depleted.
So when “Hold to sprint : Off” is selected, basically you have to manually repress the keybind between every shot to toggle the sprint again. It feels like a slight stagger, and you can’t slide because you’re now in walking mode.
Whereas if “Hold to sprint : On” is selected, and you get shot, simply holding the key will put you in sprint mode again, removing a lot of frustration, especially for zealots and ogryn players, trying to slide when some shot get through anyway.
A solution would be to remove this “getting shot removes the sprinting mode” mechanic (unless your toughness get depleted, obviously), so the Toggle Sprint could actually not be lackluster against the counterpart.
(Edit for grammar and formulation)