Only the elite managers come with a track record of constant success.
We're never going to get a proven elite manager, even if we were still in the EPL, so we have to try one of two things. Take a manager who has had success at some point in their career, or take a manager with the potential of being an elite manager. Obviously we went with the second in Enzo, last time in the Champ, but both ways have inherent risk.
The third ways is competent, steady, won't get you relegated, but I don't think any of us want that.