I'm not meaning to imply that don't.
What I'm trying to say is that in a game with E6/Runequest-style play - skills are more important than spells, travel is by foot or horseback rather than teleport even for powerful PCs, etc - we are not talking about a D&D-ish game at all. We are not talking about a game in which the playes, by using their PCs' magical abilities (teleport, rope trick, healing etc), can exercise a very high degree of control over scene-framing, the passage of time, the mitigation of consequences from past encounters, etc. And, therefore (in my view) are not really answering the question posed by Hussar, which was (I think) fairly obviously talking about a 15th level D&D-style party.