I've never played Betrayal at Krondor, but the Elder Scrolls leveling system rewards grinding. I remember playing Morrowind when it first came out, and players would tape down their control key and park their character behind an NPC. Then they'd go to bed and sleep while their Sneak skill leveled up. Or in Oblivion, how people would just stand there while a mudcrab attacked their character to level up their armor skill. Is it more realistic? I suppose so, but I certainly don't find that entertaining.
If PE were to implement a system, I would hope it would be done for the sake of gameplay, and not "realism" (which, IMO, is not a worthy goal in itself). Realism is an attribute, not a virtue.