When I went to a retail store most home computer printers all-in-one style printers with a scanner, copier, and sometimes a fax machine has Wi-Fi. Most of the printers seem to have wi-fi/wireless printing features. The few printers without Wi-Fi did not look very nice, and have bad reviews, or they are older models which may not work for Windows 10.
I guest, some people don't want to hook up their computer to their printer with a USB cable, or they are too cheap to buy a $5-10+ USB cable from an electronic store. Plus, a printer having Wi-Fi may make people upgrade their older printer to a newer printer which can print stuff out from their tablet, smartphone, and eReader which can't connect to a traditional USB cable.
I guest, some people don't want to hook up their computer to their printer with a USB cable, or they are too cheap to buy a $5-10+ USB cable from an electronic store. Plus, a printer having Wi-Fi may make people upgrade their older printer to a newer printer which can print stuff out from their tablet, smartphone, and eReader which can't connect to a traditional USB cable.