Imo, Nin post-50 content needs to pivot towards team-based, guaranteed reward/progression model. No one in their right mind considers LOI fun or engaging. With all the work that was done on instancing I'm hoping for dungeons to one day save post-50 PvE.
For example, after unlocking the tower, it could contain a 4-man dungeon and an 8-man dungeon. Teaming could be handled same as events so different villagers could be put on a team, or more than 4 rogues can be on a map without FF. End of the dungeon is one guaranteed drop among a wide range which includes EVERY class OR some cosmetics OR "trash" drops like 3 blanks, 800 ryo, etc. but never nothing. You can clear each dungeon max 2 times a week, with a bonus 3rd with a payment of Beaks and Tails for the first dungeon, Iron pieces for the second.
Every class has motivation to join up with others and take on a structured challenge. Farmers have motivation to farm and sell mob drops to people running dungeons. The entire zone is a DZ but no one hunts here cause who the hell goes there? Now they will. I'm telling you LOI would be lit for years till the next content drop.
The barrier to mass alt exploit is having to unlock the tower, which is a huge time investment, on top of the weekly limit. Other bosses outside of dungeons don't have guaranteed drops, but respawn to be farmed off CD. I think they should have a better drop chance for blanks/ryo/blood vials, but okay, it's a good enough balance.