[Rulandor]

Count me among the people who agree with Chaosium's decision to stick to their proven mechanics, especially not including an ad/disad system.

Why? Because I have years of experiences with different sorts of those systems (especially GURPS and Storytelling's Merits), and I learned to dislike them thoroughly (GURPS) or moderately (Merits). As a GM, I am prone to spontaneous characterizations of non player characters, and as a player, I like to be able to over the course of time decide whether my character has a secret or is the lost heir of some noble family (if the GM approves or even suggests it) or is very brave or rather timid. I do not like needing to pinpoint such character aspects from the beginning and then being stuck with it, unless being able to buy the character free or some such thing.

This is the main reason for BRP having become my universal system of choice (apart from its formidable ease of play).