Idk if these are real feelings or exaggerated for attention but I don't think there are any impossible quest spots to solo in the eureka series. It's just hard and risky to get through without being spotted but you can make it. The quests also remain open if you make a mistake and level down after accepting them, so you can try to sneak through again and complete the quest without having to level back up first. Hopefully if you die alone anywhere, somebody will come to res you, avoiding any exp loss. Eureka design targets a certain kind of gamer and wasn't expected to be liked by everyone. Doesn't have any design failings that are bad enough for anyone to be fired.