In some way you are obviously correct. I believe Twist seems to play that way and he kills a ton. But on the other hand you seem to like those 100% skills and while I could reliably practice skills to 100% before when you you could practice on 1xp mobs I really don't know how to do it anymore.

I assume some players have some favourite mobs, tricks and the right gear to practice effectively because I take way too many hours for tiny improvements.

So in that way it has become one of those skills/techniques that people don't tend to share and a few possess.