Posters and signs. Oversized Greeting Cards. Most XY plotters of the past can handle large sizes. Comic book industry standardized on 11x17, so most common, but art stores carries poster size paper as well.
You can make a template that put the plotter in certain distance/spacing as to make multiple plots. That way, you can simulate drawbot capability without actual drawbot. Like printing multiple pages on a printer.
The problem with printer is that page size is fixed. That's fine for business. Art application can use larger size area. It's niche, but if you need it, there's no substitute.
If you're curious, that's the A in STEAM. It has different considerations other than just tools. Thank you for replying.