So shotguns should be the only secondary that takes two shots to kill? Also why are snipers supposed to not be OHK on ranges under 100ft? Just because their bullets are designed to travel far doesn't mean they're basically confetti before reaching a certain distance. Plus why is the shoulder barge the exception? It's literally the easiest thing to use out of the four things you listed, one free kill or your money back.
Not to mention once or twice in that video the hunter stab was his melee ability rather than a standard jab, which brings up another point, why shouldn't the hunter's backstab be a OHK? It's definitely harder to pull off than a shoulder barge and requires your melee to still be up.
In fact pretty much everything you said is "make titan the best class pls".
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Better start giving people their money back. A fully armored titan can survive a shoulder charge with a sliver of health.