The last few years I did a lot of spreadsheet work where I was going back and forth between 2 or 3 different tabs or files and it was so easy. But my older coworker (who was really smart and did sys admin and some development work) worked from home using just her laptop. Not even an external mouse just the touchpad. And she also did some heavy excel work. And when she started going into the office where they had dual monitors, keyboard and mouse she literally refused to use them, claiming they messed up her laptop. As far as I know she’s still working that way. Talk about set in her ways (and stubborn as hell).