Modern Epson printers track ink use, not page count, for determining when a cartridge needs to be replaced.
The printer and cartridges only declare empty when they are in fact empty based on the amount of ink used, and will not prompt for replacement solely because of page count.
In my experience on a WorkForce WF-3540 and Epson 127 cartridges, "empty" cartridges are indeed physically empty. There is so little ink left in them that you practically cannot hear it when you shake the cartridge. I wouldn't worry about it.