Eh. If they did that then I would also expect them to increase the kills needed for each tier by at least x2. I prefer to play co-op, but find myself playing solo just as much. Besides, I’m guessing a lot of people farm solo too which would help complete a few challenges in the process.
I made a board about 2 weeks back about some of the more ridiculous challenges. I just ask that every challenge not be brain splitting insane.
As resistant as I am to congratulate them, they at least made the challenges in the new DLC reasonable. Got tier 5 on the glitch and clean sweeps on the first playthrough.