"hire the people who look promising, and fire them promptly if they don't work out." What's the difference between that and a pre-hire, high workload paid assi

"hire the people who look promising, and fire them promptly if they don't work out." What's the difference between that and a pre-hire, high workload paid assignment? The only practical difference I see is that the eager employer gives the new employee some false hopes of slight stability, which may cause her to uproot her entire family, e.g. "got a job in city X, honey, we're moving".