No.

Is Anthem still up or has it been shutdown?

It’s still up but miles worse as you can get plenty of loot but none of it matters because everything plays the same

At least power level matters in that. I can take my max level Colossus into a normal mode mission and utterly annihilate everything.

That's one thing they got right in Anthem. If I'm over levelled in Anthem, I can go in and beat the crap out of anything. So if I'm feeling laid back and just want to get my Casual on, i can do that. If i want a challenge or better loot (well better is like more higher level, not really "better"), I can pick a harder difficulty. It's all about Choice - which is the exact opposite of how Bungle operates. "You can play any way you want, as long as it's our way".