I have so so many "friends" who have done 1 lootspot once at some point. That isn't a friend. Friends should be people I want to talk to outside guild or trade with regularly or even lootspot with regularly not 1 off people swapping a lootspot.
Solution: invite to adventure to work like the to field in the new mail.
Another solution: Delete "friends" who haven't done a lootspot or talked after 30 days. Just tried deleting a load of people but it's just too slow so I'll just leave it there to lag the server up some more
Alternate and more likely solution from the extremely annoying BB devs who don't play the game: make it a requirement to be friends with someone to send them a mail