Hi,
There are currently 9 manufacturers of DCT / DSG transmissions.
Some of these uses wet clutches, some of these uses dry clutches.
https://en.wikipedia.org/wiki/Dual-clutch_transmission
Here is a previous thread on this forum about the technical details:
https://fordforums.com.au/showthread.php?t=11410755
It seems the main problem for Fiesta / Focus is the design using dry clutches, (cheaper than wet clutches) and they are electrically actuated rather than hydraulic.