If low gravity reduces muscles and bone stability, high gravity might strengthen muscles and bones for one thing?
Given time to adjust, maybe, but I wonder what the immediate effects of high-gravity would be on an average human? And just how high is too high to cope?
And, yeah, the idea that Vulcan has a slightly higher gravity than Earth does seem to have seeped into our collective understanding somehow. I'm pretty sure I've alluded to in my book and nobody, not fans, not Pocket, has ever flagged it . . . .