Why drive people nuts?

If someone is more settled in a more classical way, why would you assume you had it down by being more, like, childlike?  Practice makes perfect, and I haven't seen certain things happen, yet, and it seems like they should have.  I understand if you're really doing something, but, if you want to put on a show, why not nail down certain consistencies to make people feel alright?  By alright I mean comfortable, settled, not like there's something that's gonna drive them nuts.