Point 5 only works if you only scale the difficulty for 1/6th of the available story missions. Who doesn't like a 4 day rotation of the daily challenge? Because it was to hard to simply scale up the currently existing enemies in hard to level 32 like they do with the few that are there. Oh, and make sure the daily is near worthless. Gaining 20 extra credits when the other challenges give 30 anyway really convinces you to not grind the quick and easy challenge modes and instead suffer through the power plant missions!