Libre Office Calc is pretty similar to Excel for general use. For importing csv files it has always been superior to Excel. Some niche areas in Calc are also better than Excel. Inflexible users are locked into Excel, but for general purpose use Calc is all you need.

Libre Office is great for replicating what Excel did 10 years ago. Excel has a lot of things that power users use (like Power Query) that Libre Office simply isn't even trying to replicate.

When developers tell me that I could use Calc rather than Excel, I ask them if they would be OK being forced to use Emacs or Vim, whichever is the opposite of what they spent the last decade perfecting.