... because thinking yourself superior to people from 400 years in the past is a totally human thing and it's something a 21st century person would think of stuff from the 17th Century.
We have access to technology and other advancements, but we are in no way "superior" to our ancestors of a few centuries ago, at least I don't feel that way.
The clothes do not make the man.
"superior" is far to general a term; using only it, you can't make meaningful pronouncements regarding whether present day humans are or not superior to their ancestors.
You need to define the criteria you use for applying the label "superior".