Apparently the HP cartridges have the printhead within, and the Epson does not. Thus the Epson has to keep the heads clean by doing these cleanings.
Also, only turn the printer off by its power switch, not at the plug.
I still haven't figured out where the ink goes - am I going to find a big puddle of ink if I lift up my printer ?
edit>> apparently there is a reservoir underneath the carriage which contains the ink used in cleaning cycles. the ink dries harmlessly there and should never require cleaning.