Up until the higher levels I was getting the 50% buff. Around Level 87 or so i noticed that the daily enlightenment said I would get the 50% but when I completed the daily quest, it only gave me 20% I am not sure if I was seeing this correctly or not and was just wondering if this was happening to anyone else
I believe the main purpose of it is to get through the earlier levels quicker, not to mention old content as a lot of players already played through them several times. It being beneficial to lower levels make sense to me.