You know you can reference other workbooks in excel?

Aye, but the use case was for SQL-y type joins and unions on multiple different data sources. It's stuff that might just've about been theoretically possible in Excel, but there were too many rows so it killed my PC.
I've learned to use Tableau Prep since and gone back to the same data I wrangled with R, and the thing is a fucking miracle, and within about half an hour of first picking it up I'd done what took me ages to get up to speed with R for.