[fakedang]

Honestly if there were an Office, or rather Excel, alternative that ran on Linux perfectly, people would have switched aeons ago, even in corporate.

[cornonthecobra]

OnlyOffice is pretty darn good IME. I use it with some function-heavy accounting workbooks, and a gf uses it for her interactice rail network time tables fed via python from RTT et al.

It even has a complete dark mode.