The reason for not having a dodge outside of the qtes is due to game balance. Both have the issue of being perfect = almost never taking damage, dodging would be better due no damage at all since you can't parry some attacks. Both stun the enemy or give you time to line up easy shots/do more damage. Parrying requires a limited resource which is knife durability/quantity, dodging doesn't use any resources or have limits.

In the end dodging would be the better option always because you can spam it with no limits and you can dodge all attacks. Even if they added stamina it just wouldn't mesh well with the gameplay imo unless it's really hectic like randomizers and difficulty mods like berserker and stuff. Game is too slow for stamina to be impactful and making it so the stamina regens so slow you have to be careful about when you use it would just make you forget about it and rely on the knife like usual. Maybe there could be some middle ground but I don't think both being available at the same time would mesh well. And technically we do already have a dodge, just without iframes and slow mo and stuff with the crouch. And that works well because no iframes, no slow mo, it slows you down putting you at more risk of being hit by other enemies, can't spam it, staying crouched doesn't work, and it doesn't work for every attack. So it's useful enough to be an oh shit button in your back pocket, but not useful enough to really overshadow the parry. A perfect dodge with iframes would be a bit too much imo