Honestly Herman, like others I have no issues scrubbing and rinsing up and down, sideways, at 45°. You name it I scrub and rinse like it, even upside down if it gets the job done, all with my quick-loq swivel. On top of that I also use Gardiners gooseneck valve with my swivel. The kit we use works for us so why should I/we have to prove it? I'm not taking issue with you. It's just the way it is.
One suggestion of yours I do use Herman is the filing away a small section of the inside of my quick-loq sockets with a small half round file to make them easier to fit. that works really well.