As someone who uses Excel on Windows and Calc on Linux, I can totally understand. There are some big differences so there’s a valid reason for sticking with Excel. Casual users won’t notice anything big, but advanced users will.
On the other hand, if you’re an advanced Excel user, it usually means you’re trying to make it do stuff that it isn’t very good at. If you want stuff that Calc can’t provide, it’s a clear sign you should have written that calculation in R or Python a long time ago.