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Leading finance for a capital intensive company like Tesla is not a 'dime a dozen' job.

Tesla builds cars by relying on very complex financing. Financing is critical to Tesla existing for the long term.

Any knowledge which wasn't transferred into a document of some kind will either be lost or have to be re-learned by experience.

High turnover in any sector is terrible for business. This is true even for relatively "unskilled" labor: informal, often unwritten practices between workers are essential to any kind of collaborative work. See the "slightly different sense" here: https://en.wikipedia.org/wiki/Work-to-rule

Tesla is asking suppliers to return money already paid to them. Turnover in the finance department probably impedes those negotiations.