If dolphins could communicate with us they would surely tell how much easier it is when you have ultrasonic hearing. All humans are therefore disabled and in need of fixing.
Or maybe not, if dolphins turn to be wiser than an average human.
If all humans could echo-locate except a subset who couldn't, I would say that group is at a small disadvantage, yes, because the set of things the main group can do is 'objectively' greater. I don't know how relevant it would be for us especially in the daytime, but hey.
I agree. However, whether all kids should receive gene therapy to develop the echo-location once the science allows for that is a more nuanced question.
