You want to weed out people who are clearly unqualified, but that's not rocket science. Beyond that, every company has a different hiring bar, a different process... and approximately zero data that their approach works better than anybody else's. Interview performance is a poor predictor of job performance. Whether the bar is high or comparatively relaxed, around 70% of the people you hire will be good, and the rest will underperform, leave after a couple of months, have difficult personalities, and so forth.