Eikn
I agree that you will have more base HP and stamina/sap to fight mobs, but your outgoing damage is still limited to the skill level you are training. Even worse, the skill level will also determine the opponents chance of dodging/parrying or resisting magic. If a mob is 50 levels above your skill they have about a 60% change of dodging/parrying. So, I really can't see many people efficiently fighting mobs 50 levels above their skill level- you could probably kill 3 mobs 20 levels above you in the time it woudld take to kill 1 mob 50 levels above you. The first thing you notice when you start leveling another profession after your first master is how you can slay monsters way higher than your current skill level.