Shared housing between multiple characters on an account isn't a new concept, but it is very desirable since we have the 1 plot per account per world limit in place. Having a shared account storage is also a good idea which other MMOs have already in place (i.e. Lord of the Rings Online, Star Wars the Old Republic, Star Trek Online to name a few examples). The only drawback is SE doesn't seem to know how to link characters on an account together without creating openings for harmful exploits and it doesn't seem they have the staffing or talent needed to solve this particular issue anytime soon... if ever. Considering they haven't done much to update XI to improve compatibility with current generation PCs, it's likely that many issues in XIV won't be solved until they put out the next MMO (assuming there will be one eventually).