There is a matter of becoming acclimated to a new environment. Also although we know Vulcans are stronger on average than humans doesn't automatically mean their strength puts them on a superhero scale in comparison. For them to be of similar size and form as humans than the gravity of Vulcan likely isn't that much more than Earth's. Spock and any other Vulcans would have become acclimated rather quickly to new environments not long after leaving Vulcan. Amanda Grayson was also able to cope with living on Vulcan for decades, something that would have been extremely difficult if the gravity and environment had been too different from Earth's.
The Klingons seen in TOS were really no stronger than humans or Vulcans. It's in the films and spinoffs series that idea was put across. But in hand-to-hand combat the Klingons didn't impress me as being much more dangerous than a well-trained human. The Klingons (after TOS) look more fierce and dangerous, but so do Hell's Angels bikers yet that doesn't make them any stronger or more dangerous on average than trained police or military personnel. Indeed a well trained U.S. Marine should likely wipe the floor with most any given Hell's Angel.
The Klingons seen in TOS were really no stronger than humans or Vulcans. It's in the films and spinoffs series that idea was put across. But in hand-to-hand combat the Klingons didn't impress me as being much more dangerous than a well-trained human. The Klingons (after TOS) look more fierce and dangerous, but so do Hell's Angels bikers yet that doesn't make them any stronger or more dangerous on average than trained police or military personnel. Indeed a well trained U.S. Marine should likely wipe the floor with most any given Hell's Angel.
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