I have fixed the problem on my Computer.
After having received the MacBook Pro from the Factory I experienced this problem and did a quick reinstall. Same thing.
Today, I tried just about anything I could think of to get it to work. Nothing did the trick.
In general I was really disappointed with this device. Three Finger Drag Miss, Jerky Graphic Performance and what not.
Anyway, I decided to Wipe the Internal Hard Drive and CLEAN Install the OS from USB Bootable macOS Sierra before returning the device tomorrow, as a last resort.
After doing doing this - all my issues magically just went away I was able to actually for the first time NJOY this new MacBook Pro.
No matter how hard I tried I was not able to provoke one single Three Finger Drag Miss. Not a single one. And tried really hard. Also no matter how soft or at which angle I put down my three fingers could I replicate all those issues I had prior to clean install...
And Install-Over won't do it. It HAS to be cleanly installed by FIRST Wiping the Internal hard drive entirely which is something I think most won't want to do as setting it up all over would be a lengthy process. To me it is worth the stretch as in the end it will save me hours of time per month being able to use three-finger-drag.
Anyway, given the fact that the Factory Install sitting on my MBP coming from Apple had this issue and a clean install resolves it is an indicator of something off in the way the system is being copied to the drive. Why the normal install-over also did not solve the problem alludes to the fact that an install is not an install.
I'll keep an eye open for those issues coming back after I begin installing Third Parties etc. And report back if they would break anything.. But until then, the clean install cured all the issues of which I have been writing the past 24 hours.
As a 'Side Effect' it also cured ALL Jerky Graphics when Automatic Graphics Switching was on (Thus allowing Integrated GPU). It was like getting a brand new Computer. Which is what I wanted to have as I bought it 😀