Yes, oh my god, that's terrible :( I prefer LibreOffice but sometimes I run into Excel at a job or similar and the last time I did the computer I had to use was using Norwegian locale (I've been living in Norway since the age of four) and there was no way to switch it to English without admin privileges (which to me is a pretty huge WTF moment by its own right), and even if I had been able to I don't know if Excel has the English locale installed or not.

So when I had to use Excel all the formulas were named in Norwegian.

I downloaded a portable version of LibreOffice but that triggered the anti-virus :I

Sometimes I would use Google Docs instead but for company confidential information I obviously won't upload that data to Google so then I'm stuck with Excel. Even for non-critical data Google Docs might not be an option simply because you are working on the file together with someone else who is using Excel and constantly uploading and downloading the file would be annoying, as well as the risk of Google Docs not supporting 100% of the features of Excel leading to complicated spreadsheets getting mangled. (Same problem with using LibreOffice to work with someone using Microsoft Office.)