It is not a rookie mistake but the opposite: a veteran overengineered, unwilling to repeat mistakes yet cannot find a new path.
PL is a generic power indicator, which is similar to natural accuracy, a sound if risky idea. Sawyer and co. are obviously able to identify the potential pitfalls and they do mend some obvious holes. Thing is the holes are obviously there if you look hard and it makes the game unintuitive. POE1 has the same problems, Deadfire took huge steps but might not be enough for new players.