Need to address the Eureka in the room.

[Kalise]

You can see the main problem with more activities in the open world at the beginning of every addon.
They had to make 3 instances per "open world zone" for SB to carry the burden of many players being there.
When Ixion spawned and everyone portet there, the servers just crashed. Thats why we have instanced Eureka with a limit of 144 players.

Would it be nice to have more activities in the open world? Yes, but we have to be realistic.

Step 1) Open World Zone Instances
Step 2) Player Limit on Open World Instances
Step 3) ???????
Step 4) PROFIT

Just being realistic here >.>

Yes, you devalue things like Ixion spawns and Hunts because you no longer enable thousands of players to all leave their preferred AFK City to all jump in on a spawn, but to be honest the way that things like S Ranks and Ixion spawn are not particularly well implemented anyway.

Meanwhile, you'd open up the possibilities of you know, actually creating open worlds that matter, by having FATEs, chains, A Rank and B Rank hunts, Raid FATEs and the like actually being valued. Without having to shove all this actually worthwhile open world stuff into a separate Eureka zone while leaving the actual open world to rot when it's only ever used by people doing MSQ or gathering (Outside an S Rank/Ixion spawn when everyone flocks to the same place and crashes servers >.>)