Why do I ever need "Report" function to generate text report such as invoices, quotes, while Word Template can already take care of things easily and have buttons to easily create or email the PDFs?

As title, since Word Template is easy and intuitive to make out-of-the-box, but Report requires XML to make it look good and organized.  I'm trying to figure out what "Report" can do, but "Word Template" cannot, so people keep using "Report" a lot?