I've seen many cases when a friend's ex or a guy interested in friend has gone out of their way to look for them in the world without consent. Whether that's in Limsa, at their house, while they're gathering in the middle of the Sea of Clouds. Once is a coincidence. Two, sketchy. More than that? That's .... deliberate.
Once you friends list someone, even if you delete them from your friends list, they still have you on their list. They can still see where you are, if you're online, send you tells regardless of world location. (Blacklist can block /tells yes, but that doesn't negate the other bits.) I really don't understand this. I can't think of any other form of social that doesn't at least let you soft-block someone to get someone unwanted from following you. Please make this a two-way removal.
The same goes for the in-game player search. Maybe the player search is meant to help you find if your completely new to xiv friend is online, so you can send them a /tell and meet up with them. But giving the entire public the ability to find out where you is unnecessary.
(Honestly I don't understand why you would use the in-game player search aside from these two reasons, or a scammer sending scam /tells to complete randoms.)
And while the blacklist/block list does block tells from unwanted people. They can still enter your house ? I can understand if it's not possible to keep people out of an FC house, but at least it should stop unwanted people from entering your apartment or personal house.
Please, Square, even if you making 'stalking' against ToS, you are still giving these people the tools to make it easier for them to do it. Yes, a dedicated stalker could bypass restrictions if you took these tools away, but it would at least make them work harder to stalk. And it would make it easier to prove that they're putting in the effort to do this.
Ideally it would make less dedicated stalkers give up and find something else to do with their lives.