I don't necessarily disagree with you. But there is a distinction between what you call 'regular scientist' and 'data scientists' right? Pretty much all 'regular scientists' have PhDs in their discipline and are working on cutting edge things in their field of expertise. The term 'Data Scientist' is used much more loosely. Besides, do a lot of those regular scientists call themselves scientists? The term 'scientist' has an air to it. To some, 'data scientist' sounds more presumptuous that 'machine learning engineer' or 'senior modeler' or 'statistician'
I can see why the term 'statistician' doesn't seem to cover everything in a data scientist's skill set. Perhaps we need an alternative moniker.
