Are you saying just grinding anywhere in the world yields the same results? Grinding while doing all quests is what I gather.

I have noticed since coming back that the 20-60 XP change is ridiculous. I am on my 3rd casual day and they are already 25. So I question the need for using this strategy. Also, leveling them up the normal way is a lot less boring. And your weapon skills won't suffer from being powerleveled.