Experience does not mean perfection. You can have an experienced pilot with poor knowledge or an experienced pilot with poor flying skills. Even the ones with great knowledge and flying skill can become overwhelmed when they find themselves in certain emergency situations.
We have seen accidents happen where experienced Pilots were unable to identify and recover from a stall but their supposed inexperienced first officers were able to identify the stall. This is just an example.
Bottom line is is, even though we need experience, proper and intensive training goes a long way as well.