Because the controller with little screens is the only unique selling point this debacle ever had. The programming and manufacturing complexity make that feature into a boat anchor tied around their necks.
Extra firmware, batteries, wireless radios, compliance testing for all — no wonder the price went up.
There’s probably a very good reason none of the real game companies attempted second screen gaming after the failure of the Wii U.
Had Amico been redesigned to work with conventional controllers, it could have have launched, failed, and been forgotten by now.
At least they managed the second and third steps of that process.