I think I recall reading somewhere that when using an Epson printer, it isn't necessary to match the "Media Type" setting (i.e., "Matte" or "Glossy") to the paper—that when the print job is queued, the Epson print driver will negotiate with Lightroom to ensure that the media type selected in the Print Job panel matches the paper selection made from the printer's front panel. (I'm using a P800 and printing from MacOS, in case the particular hardware or operating system may be determinative.)
I assumed I read that in Jeff Schewe's The Digital Print, but I've just checked the index and flipped through the relevant pages and I can't find anything about an automatic synchronization, just an explanation of why the output sharpening needs to vary with the type of paper surface.
The reason for this inquiry is that I can't seem to remember to reliably set this parameter manually. I frequently discover only after the printer has started chugging away that the setting displayed in Lightroom doesn't match the paper.
Before I waste a lot of time, paper and ink trying to determine this through testing, I wonder if anybody can point me to an authoritative reference as to how this option works in an Epson environment.