[snprbob86]

Why would I want to treat new-grads better than experienced folks? And why would I want to incentivize somebody who doesn't like it after 3 months to stay for 4 months?

The 1 year cliff prevents disinterested parties from holding equity in my company and helps me retain people who have become important over time during that first year.

You're proposing improving my retention of lesser experienced people with lower bus factors in my organization. That seems backwards...