It's impossible to know fully how someone performs in a team without interviewing their former team(s)—which is largely impossible, against corporate policies today due to the litigious nature of the game—and knowing your own team extremely well; not every player is a match for every team. A terribly genial "interpersonal" person who exhibits all the textbook signs of "team player" can destroy a team's morale with incompetence, interference, lack of discipline, focus, memory, tool adoption…
Bad hires are extremely expensive in tech and can be disastrous for a project/team. In modern corporate, and highly regulated business, environments firing someone can take months or even a year because the only thing more expensive than a bad hire is a wrongful termination lawsuit.
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