I guess they could always make the open-world bosses so incredibly tough that multiple parties would just become part of the strategy. Like a HNM that requires 6 tanks because he one-shots all of them and you have to chainspell rebirth them before he one shots the rest so that he can one shot that tank again. rinse repeat.

obviously this isnt appealing lol. This whole idea of no open-world content is actually very unappealing but so are a lot of the things ive heard floating around and i've yet to see their implementation.

you voice your complaints and cross your fingers.