Eventhough I understand the sentiment of the OP I have to disagree.
The Prince is extremely powerful as is… he can occupy a person 3x in a row… even if said person is occupy immune. He bypasses night immunity with his execute. He can also protect someone against conversion/death by jailing said person. He has royal blood so he can easily step up to King if need be in the end game etc.
The whole idea for evil factions and the NK is to find and kill the Prince asap… yes this can happen by sheer luck n1. If it happens the dynamic of the game changes, the Blue Dragon will have to double their efforts to win and that makes it all the more fun.
The Prince not having death immunity in its current state is much more fun and when playing Prince myself its always tense every single night to see if I survive. That keeps the game moving forward and exciting.
Plus if your team is any good you can still easily win with Blue Dragon. You have knights, healers, investigators. Its only when deduction skills are lacking that the Blue Dragon loses since they start with a vast voting majority.