I think you’re overlooking the difference between diversity and changes to an individual. Some people can’t get stranded ankles because they don’t have legs, s

I think you’re overlooking the difference between diversity and changes to an individual. Some people can’t get stranded ankles because they don’t have legs, so you don’t necessarily need a universal baseline across all of humanity when diagnosing conditions. Someone who is still within normal ranges but significantly doing worse than they where can quite reasonably seek treatment.