Depend on Excel Serialization module?

Example things that are relevant to this module at the moment, but could be not :

📌 setCellValueByColumnAndRow is deprecated since 1.23.0 Use the setCellValue() instead Fixed
🐛 Strings starting with "=" creates unwanted formulas Needs work

While I agree reusing code is usually better, I am not sure it is the way to go here.
For example, I think we need to access PhpSpreadsheet directly because we need to be able to reopen our XLS file in XlsxExporter::openExport(). It looks like xls_serialization only allows creating a new spreadsheet every time and does not support batch processing.
(But a patch that proves me wrong would be welcome.)

I guess another solution could be if webform started using the serialization API for exporters, this way it could be hooked to any serializer (but this is out of the scope of this module).