Never giving raises and expecting 2-year turnover are pretty much one thing rather than the two that they might initially appear to be.

Your parent comment states that there exists no known form of interviewing that captures the trajectory of the candidate. I stated the existence of one, thus showing that there exists a known form of interviewing that captures the trajectory of the candidate.

I didn't state that internships solve all of your hiring problems. I also seem to work in a different company than you because our tenure is higher than 2 years and many interns make it to the senior level.