I am not sure as to the reason behind why item and warehouse filters were introduced on the stock balance report. Must be a technical reason because from a business perspective the new configuration is very limiting.
Often times you need the report to trace material. You may need to export a complete stock balance report
Assuming that without a strong reason you wouldn’t have moved to the new configuration, the optimal output would be to ask Frappe to use only one - Item or Warehouse filter. How do we export a complete stock balance report?