Why is the opening balance important during reconciliation?

https://quickbookhelpdesk.com/blog/bank-reconciliation-problems-solutions/

The opening balance serves as the starting point for the reconciliation process. If it is incorrect, the entire reconciliation may remain out of balance. Bank reconciliation statement problems are common, but they can usually be resolved by carefully reviewing your financial records and comparing them with your bank statement. Missing transactions, duplicate entries, incorrect dates, outstanding items, and edited reconciled transactions are among the most frequent causes of reconciliation differences.