It'd be great IMO if the game had more stuff like this. Though it would take a lot of work.

Take things that 'are' account wide for example. Like SOME (but not all) mog station mounts. Or subscription reward glams. They do this by just...sending the mail to all of your characters.

So it'd be great to get account wide stuff but would probably be a big undertaking on the back end to make it all work. And sadly, one downside to being able to do everything in this game on one character means they're less incentivized to add account wide stuff than say, WoW was.

But I would like to see a lot of this. And one thing I would really like to see: let us send mail to our own alts, and add our alts as housing tenants! It'd be really nice if I could adjust my house on my alts. I know there used to be bugs one could use to friend your alts to get around this but those have been fixed and now for some reason you just can't. So trading an items or gil from one character to another either requires weird market board manipulation stuff or getting another player as a go between. This just feels completely unnecessary for both sending letters and housing.