"How is it any different than the RTTY setups used for DXpeditions that  would 
do essentially the same thing, listen over a wide range and stack  the calls 
heard?"

The, in my opinion huge, difference is that FT8 DXpedition mode does not even 
require the operator to be in the shack to complete the QSO.  All it takes is 
to start auto TX of your grid and then walk away.  As long as your call gets on 
the stack before your watchdog times out (assuming you have not defeated it) 
then the rest is automatic, including waking up your TX Enable if it had timed 
out.

Two of my KH1 FT8 QSO were completed after I had given up and turned off TX 
Enable.  Although I was still in the shack I had no involvement in completing 
the QSO.  I was just a spectator.  That is very different from the level of 
interaction required to complete a QSO in CW, Phone, or RTTY.

I have no opinion on the experience of the DXpedition operator.  Never been one 
and not likely to be one.

73,
Andy k3wyc


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