for some reason this
seems setup seems to be seen to be ok for city airport

Because it's a toy airport.

Now it yes yes. But infrastructure tends to grow in line with
the transport links to it. If the jubilee (or even DLR) had gone to
the airport much earlier it would probably be handling far more
passengers now than it does. Admittedly it'll never be another
heathrow simply because of the space limitation and length of
runway , but thats not to say it won't become a major short-hop
hub. Of course whether we want any more air traffic and hence
pollution around london is another matter entirely.

B2003