I think it is how one looks at language structure. For example, I believe and was taught that there are distinctions between dogs such as poodle and St.Bernard. If I wanted to specify/buy one or the other(s) I would not just ask for a dog. The same logic applies as to when it is explicitly written in the Constitution that ‘citizen’ applies for congresspersons and ‘natural born citizen’ is specified for POTUSA. If I want a large dog I ask for a large dog not just dog.
I quite agree. That’s why nobody is claiming a naturalized citizen is eligible to be elected president.
The argument is between those who consider all citizens at birth to be NBC, and those who consider NBC a special subset of citizens at birth.
I’m in the first camp. YMMV