Web developers often obsessively optimise for small screens, do "mobile first", but for some reason ignore the desktop, where most of the professional work is done.
Google Spreadsheets is literally for spreadsheets, one of the most boring (and exciting, if you ask me) things computers can do. It's often used for accounting, reporting and other work of similar nature. The kind of work that is done on large screens due to the amount of visual data.
And every time I need to change the location of a document, I'm presented with a tiny dropdown menu with 5½ folders visible. It's not responsive or adaptive in any way.