Just to clarify a little on drop rates specifically: you shouldn't notice much difference at all if you're just farming raids out at 150. We've adjusted the formula slightly so that people should be able to better feel the effects of pushing to 200, 250, 300, etc.
Like the blog states, 150s were proving a little easier than we thought they might be, and 300s a little harder. We don't want anybody to feel hard-done-by and want to reassure you that we're not trying to make things longer for you, just to make things feel more rewarding for people pushing into the 200s and beyond.
We'll keep monitoring the change and any feedback around it and are happy to make further changes if needed down the line.