Why is it crucial to evaluate employees for soft skills?

I was having a conversation with an employer who was looking to hire. She was experiencing a high staff turnover due to a toxic work environment brought by conflicts.

“When conducting exit interviews, I found out that two of my employees; a manager and a staff are constantly in conflict with others due to poor communication which made it hard for the rest.

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Note: The results are not exact but very close to the actual.