I've been dual-booting Linux and Windows for a while, with Windows as the fall-back option in case I wanted to use Office for something. Now that they tried to trick me into paying a subscription for their AI slop machine, I'm finally, fully out. It was a pain to actually track down and back-up the stuff that was held for ransom in OneDrive, but now it is done.
Depends on what you need from Excel. All the simple stuff and most of the medium complex stuff is available in Calc. However, there are still many Excel only features where Calc can’t compete. Not a big deal for most people since those tend to be slightly obscure features anyway. If Calc can’t get the job done, I suggest switching to R or GNU Octave. You’ll thank me later.