Admittedly naive question: if the advantage of having Google Sheets store the data is that you can use the Sheets editor when you want to, could something like

Admittedly naive question: if the advantage of having Google Sheets store the data is that you can use the Sheets editor when you want to, could something like Sheetsu store the data separately, much faster, for the API, and then just sync any changes between the Google Spreadsheet and their data? So you could still access via Google when needed, but these problems don't matter?