This is the worst take on this matter. No, you should be honest. If that upsets people because they aren't performing you can use that as an opportunity to figure out why they aren't doing well. This should be a mutually beneficial thing. But because people are salty, and because it feels like (feels like, not is) its easier to just hire a new person and toss the current one this leads to employers opting for the cost of a high turn over and bad feelings all around. Dishonesty only pays if you don't think about it at all.