Because it sounds cool...I remember when I was applying for college (2001), nanotechnology and biomedical engineering was all the rage. Glad I stuck with electrical engineering.
My friend who majored in biomed kept getting passed over during her job search. Turns out all the biomed companies just wanted to hire mechanical engineers. (She did eventually find a job in her field.)
I guess it's analogous to the data science degrees popping up today. Will be interesting to see if it ends up as a fad degree or a legitimate career path.
My impression (as someone who was once very interested in biomedical engineering) was that it was always mostly mechanical engineering plus some bio/chem and teaming up with doctors. I didn't end up going that route but I got an ME from a school where a number of mechanical engineering professors worked with the affiliated hospital on projects.
The people I knew that majored in biomedical engineering went on to med school... Probably one of those areas that is always in the news and science magazine but still too early to revolutionize life.
I remember when Dolly was cloned and we would have a whole new industry...