Say your company hired a SW engineer who had merely taken an introductory programming course on Coursera, and other than that had no experience. And you immediately make him a senior person, and let him define the role he will play in your company.

Oh, and he didn't have to write any code during the interview.

You don't see anything wrong with that?

I think it's fine to hire a person who just took Coursera ML courses and passes the interview, but you would normally position the person to be a junior with senior folks overseeing his work.