I assume that is because you can crank up the flow with the
Sapphire and not have water going all over every time you life the tool off the fabric, correct?
Yes.
I'll also assume that you had the solid blue
Sapphire and bought the Mytee because it is clear, partially, correct?
Yes
You could lock the trigger and turn down the flow on the SS and get the exact same performance as the Mytee, correct?
Yes
Other than the Mytee having the adjustment valve on the handle instead of the other end of the hose, what would be the difference between the new invisible SS and the Mytee, besides cost?