I have 32g of memory and a SSD on this machine. If I attempt to open a 1,000,000 .csv file, add a filter at the top, and attempt to filter by a column, my computer is done. LibreOffice will go gray and never recover no matter how long it is left. Eventually it will crash. Do the same in Excel and it will successfully search the column and return just the line items with said column.
That example is egregious as well. LibreOffice can not handle 500,000 line items files with 30 text heavy columns. It crashes on numerous basic spreadsheet operations, however Excel handles them (and quickly).
I am not a Microsoft shill, I'm running open source from Linux to Ruby/Rust and all the way down to Postgres. I would love nothing more than to stop having to keep a second windows machine setup next to me just to handle large csv files.
If LO would just make .xlsx a native format, they could probably take some market share from Excel. But, as long as there are little issues with interoperability, 100% of the world will be on Excel. Alas.
The ability to open a million line csv file with 75 columns and execute a search and replace without leaking battery acid out of every orifice in your machine.
The hundreds of long complex well vetted plug ins that are drop and play with Excel which serve niche hard to reason about corners of regulation legalese. There has been so much cross pollination between the major firms that everybody has these tools and implements their own little tweaks.
The ability to quickly spin up a VBA macro to do some heavy lifting in a client provided 250 worksheet workbook each with 50000 line items (none escape quoted so every address with a comma in it malformed the data on client export).