Parents you can tell anything to and be heard without judgement, or a list of all your failings in life.
Parents you're not afraid to tell that you tried for something, just in case you fail and it will be used against you for the rest of your life?
Just to clarify, I love my parents and know they love me back, but 10 minutes is literally the limit of co-existence
You are right parents shouldn't say this to kids directly but I do think they can illustrate that they aren't all powerful and depending on the maturity of the kid go into some of the realities of the world we live in.
I was also just trying to remind younger folks that their parents are human and have flaws and my be worthy of forgiveness for those flaws.