In message , Zonky
writes

Still, for an express long distance service, it does seem silly to add the
short stop so close to the final destination....

In addition to all the tube (and DLR) links mentioned, an international
station at Stratford means that Eurostar passengers to/from many parts
of Essex and East Anglia do not have to go to central London to change.

When Crossrail is built, it will mean that Eurostar passengers to/from
the west of London won't need to change in central London.

And if the proposed plan to run Eurostar services on the west coast
mainline materialises, Stratford will be the only London stop.

--
Paul Terry