BusyB..........1/ The 777 doesn't have "body gear" and 2/ the back wheel pairs on the 777 are steerable, so no problems in tight turns. That is not an excuse.
There's an old saying in Aviation...
3 things that are useless to a Pilot:
1/ The fuel in the tank back at the airport
2/ The sky above you
3/ The runway behind you.
If you have the practical opportunity to make use of all the runway HKIA built then why not?