I think a good compromise would be putting up at 5 or 10 min shield on s-ranks, but have the spawner(s) get a buff that can break the shield if they attack. Ofc if they leave the zone they'd lose the buff and the shield would have to be waited out. Basically a fix to stop trolls ruining it for ppl who put in the effort to spawn while still letting spawners pull whenever they want.

If they want to fix the potential congestion issue, make the rewards and achs limited to server only and adjust the amount needed for some of the longer achs thereafter. That being said I like the current crossworld hunt community on light at least (and chaos from my limited experience there), so I wouldn't personally want that. It's mainly just the impatient people taking advantage of other people's work that make it insufferable sometimes.