Channellock makes the 415 which is a smooth jaw pliers, but the jaws do not stay parallel when opening and closing like the Knipex pliers wrench. The jaws never seem to land flat across both flats of a fastener. YMMV.
I agree that smooth jaw groove joint pliers don't ever seem to land flat across both wrench flats, but that's not by necessity, it is by [poor] design.
For each groove, there is a single handle angle in all groove joint pliers where the jaws are parallel. If someone made one of these with smooth jaws:
and cut the ratcheting notches 1/16" apart for SAE or 1mm apart for a metric version, it could be optimized so that it lands parallel on standard sized fasteners, without needing a true parallel action. I've seen that design used in smooth jaw ratcheting Stillson wrenches, but never in pliers.
Still, I use my Knipex Pliers wrenches on more than just fasteners. Their parallel action actually makes them great for metal working, pressing small things, and other odd jobs aside from just turning stuff.