Many changes have rolled out to housing over the years, most of them positive ones! Initially, limiting player housing to one per character was a great change for the community, as was limiting housing to one per world per service account...
BUT
The inability to share your estate with yourself on an alt, or share an alt's estate with your main is a huge drawback considering the changes made. If you own a house on character A, but want to show the house to friends or hang out at it on character B, you have to log out of character B, meet that friend on character A so they can add that character, log out of character A, log back in on character B and then RUN all the way to your own house while your friend teleports there easily and is waiting for you to make the trip.
Did you get a headache reading that? I wouldn't be surprised, because I get a headache every time I have to go through this process.
Apparently long before I started playing, there was a bug people had exploited to "add their own alt" so they can share an estate with it, which SE had then patched so you couldn't do that anymore... which begs the question as to why? Clearly the ability to share an estate with your own alt...or allow your alts to teleport to housing you own on the same world on the same service account as a built in feature is something highly desired.
Why focus on patching the only way this was possible five years ago, and not put any thought into a possible solution? With how common it is for housing to be a pain point for players, and how difficult it can be to get a house on certain worlds, I just question as to why it would be a benefit to SE or the players to limit that functionality for any other reason than "it not being how SE intended for housing to be used".
That is the end of the rant portion of my post, if you are still reading thank you, because....
I am also here to offer a solution.
I am suggesting there be a "character sync" feature added to the game, where all characters on the same service account, AND on the same world are given access to an "Owned Characters" tab under the social or system section of the menu.
From this menu, you can teleport to estates owned by your other character, request to join an FC your other character is in, and send mail to your other character to more easily facilitate the transfer of items without the need of trusting the items/gil to still be there in an FC chest OR trusting another player to not run off with your items (which then leads to time wasted by GM's following up on scam reports)
In the long run, I feel these changes wouldn't only benefit the community, but would cause much less headaches for GM's and SE as a whole.
If you have any other thoughts, suggestions, or questions please jump in and let's have a discussion.
Thank you for your time and have a wonderful day in Eorzea!