Hello and congratulation on new update. Super unique map design and fresh gameplay.
I started new content and found what problems it contains.
1) Mission markers dissapear for no reason.
2) Decree system is infinite and creates bugs (example: every decree increase your speed by any%). Should be: Max 3-5.
3) Tamms aka "Be a cowboy and get back our sheeps" - imho bad idea, this should be optional, like fishing.
4) No way you can get out of Duviri with all the loot if you catch a bug.
These are more or less the main problems you already know, i think.
Now, to reduce the level of negativity from players i think you should make these:
1) Players should select their own missions. Example: you enter Duviri and have to do 10 different tasks. !BUT! every task you have to select/find by yourself. Players will activate-deactivate the mission by pressing start/cancel the task to take another one if selected one is bugged. Stop with this: you need to do (ONLY) this tasks or you'll not finish. If players want to play like this, they can go Fast Duviri mode. I want to search and discover, fight and solve puzzle that i find by myself, not what "YOU" give to me.
2) Decree system must be limited to avoid overtune.
3) Implement 2 ways to play Duviri - pacifist and activist (optional):
(example for pacifist: if you want you can be a cowboy, tame different animals, collect any amount of resources, find and solve puzzles, riding horses etc)
(example for activist: dungeons, duels (also in dungeons), Boss fights, air fights on horses, solving puzzles under pressure (aka being hunted by shadows),
This is just an idea, i think no one will agree on this.
4) Save points - introduce save points for every mission made, cause people will riot (like me yestarday: i played 2 hours then i catched a bug and couldn't exit Duviri, not gonna lie i was so mad i could delete warframe forever just for that.)
5) Delete the Gray/White collor palette. Its depressing to play like this. People will abandon this content. Please make it. I think this system also creates bugs.
6) Also my favourite preference would be introducing a horde mode in dungeons for DRIFTER or nemesis system (aka liches hunting drifters when your decree level is high enough).
7) Introduce companions for drifters (dogs, cats tammed in Duviri).
I kinda started to like the slowed down Warframe and finally can enjoy some open world, but new world lacks life.
Thanks for reading. I will come with another ideas if your feedback will be positive. With love and respect, Ecto.