Both my parents run on Microsoft Excel. Neither of them care much for phones or tablets, but if there was an ExcelDeck running ExcelOS and it had a web browser and worked like the desktop version of Excel does, maybe they would go for it.

As it stands though, that's not the case, so I'll be stuck supporting a couple of Windows desktops permanently.

Before you suggest the app versions of Excel or Google Sheets, that's already a step too far. My mom told me she's "basically done learning new technology" and that's just how it's going to be.