Agreed on the speed, that thing is sloooooow. And also, once you've brought screen printing into the DTG equation, hasn't it kinda defeated the purpose? The beauty of DTG is that my grandma can buy one and be printing shirts within minutes. Once you add screen printing into the mix, it becomes a whole different ballgame. I understand the idea of improving the white ink side of DTG, but this just seems counterproductive to me.
Unless the manufacturers are banking on the future of screen printing being two head presses (one white, one CMYK). I just don't see that ever looking better than an actual screen print, especially when it comes to spot color printing. But who knows.