Yeah, I thought the exact same thing as you blkGS. But even when I look at CR Spotless' own bypass system (link below) this is how it's set up. The outlet bypass only has the Y connector. Maybe there is something I'm missing, but I just think when the tap is active it somehow mixes when pushing through the output Y which has to be fully open.
https://crspotless.com/products/bypa...l&_ss=e&_v=1.0