I really think that's the best way to keep it working more as intended - chain xp parties - rather than the fate train. Keep the other rewards the same, so folks still do them even when they over level them (it will make sense to go to an nm you see pop and do it) like it was day 1/2.

I feel like this is the best solution as changing tags to party only will cause issues, and already folks with mounts beat out folks without them that need the xp. If they don't give much xp (or any) then only those who want the drops will race to do them.

This from the perspective of someone who's opened over 6k lockboxes, has 4 sets, still has 3k anemos crystals and almost 60 paz feathers.