This is the speculation.
If Ishgard is ever going to provide housing ward as in rumor, it will not be under warding system.
It will be similar to WoW Garrison's phasing technology where you have minimum ability to adjust the garden such as garden plot, chocobo stable, and mail box physical locaiton
Once you enter the interior of Ishgard house, it will be an instance as same as apartment.

Only the phasing technology is able to provide enough supply to the growing FF14 population without too demanding on physical servers