We try really hard to be Excel-compatible with all our formulas and hotkeys, etc. If there is a formula or hotkey we are missing, let us know and we will add it (usually with < 24 hour turnaround time!)

The use-case you describe is exactly what we built it for. There are a lot of people who have data that is no longer human-scale and won't fit into Excel, but they still want to use their Excel skills.

We love Excel and spreadsheets, but when working at AWS we found we just had too much data to fit into it.