As a guy who likes to solo flawless the dungeons sometimes, I dont know if I agree with this. If you have a 3 person team with high level gear and they know how to use it all, you can absolutely destroy the dungeons with little effort. Now, I like this because if you're going for specific things and stuff..no one wants to slog through the thing for hours and it's fun to have an activity with some mechanics and some teamwork that you don't need to find 3 more people to complete. If you are solo, well then you better bring it! You don't have to go flawless to clear the activity, and you don't need to clear the activity to get some cool loot. A solo player can get cool dungeon loot from all encounters and secret chests up to the boss. For example, I am practicing Spire for SF. I got the cool Tex helmet hat for my titan and Warlock, and didn't need to take out the annoying boss. Now, I will struggle bus the absolute sht out of the thing because I just like suffering. But I dont have to. :)