Wow, took forever to read thru this thread.
I have to confess, when I purchased my 2017 Tucson Sport at Christmas I didn't have a clue about DCT.
My wife and I have just driven this like any other automatic transmission.
The only thing we noticed was a very slight hesitation or delay when taking off from a stop. It's very negligible and I originally thought the delay was the turbo.
So far we have no issues and are very happy with this vehicle, but thanks to this thread I at least know to be aware of this potential issue.