This would certainly be a valuable tool as some of us still work with legacy file formats. I am currently running into that issue now where I am working with a .xls file.
Excel Online (Business) doesn't appear to support ingesting a XLS from SharePoint to do any data manipulation with the Flow I'm working on either. Seems like a big feature gap that would enable a lot of legacy platform integrations.
Desktop Flow doesn't feel good for an enterprise solution, which is how I would probably try and solve this right now.