I'm not particularly skeptical of "ethics/morality as a field of academic research". I am skeptical of people who teach in a field without being particularly skilled in it. I mean a person who teaches communication without being an above average writer or speaker. A person who teaches business without experience in commerce. A person who teaches film making or video game making without a professional career. They could be good theorists, I just have had too many personal experiences with professors without much real world experience teaching me things that didn't stand up after I had professional experience.