How do you know school use doesn’t need extra functionality? School use covers students, teachers, administrators, and staffs. And usually the choice is at the district level , which includes lots of district staffs.

The user interface of LibreOffice is garbage. The ribbon is much more discoverable than toolbars and menus (and no, LibreOffice’s ribbon imitation isn’t as good as the original).

And if you’re talking about Excel… LibreOffice Calc doesn’t have tables (with nice styling, automatic formula filling, and using column names in formulas), and working with PivotTables requires a separate dialog box with no simple live preview.