uka is the manager of a sales team at a software app company. Each of the salespeople captured person specific app sales in an Excel spreadsheet. Why would storing this external data in Access be important?

Because the sales data can provide insights if it stays external to Access.

The sales data will expand and become unwieldy to work with in separate spreadsheets.

The sales data will more than likely remain unchanged over time.

Because having orphaned sales data keeps it safe.