And the ironic thing is that these players are the ones who are least affected by balance changes. Top players receiving a nerf go from super-duper OP to extremely good. Less skilled players receiving a nerf go from engaging with the content to constant death and frustration. This is the exact reason why a lot of high schools are removing academic requirements for participation in extra-curricular activities. While it may motivate the super-academically OP student to not slack off, it completely removes the engagement for the student who only comes to school for their sport/music/club.
Dead on. A lot of the power granted by the grind either needs to be front loaded, or shifted into the base classes / trees / destinies for the appropriate toons. If you're trying to be a DC wizard, you can get +9 Spell Pen from 6 heroic past lives and +10 from the trees (and that's only as a pure Wiz if you take Tier 5 EK and spend 41 points in PM). Past lives are supposed to be small benefits that boost your character, not benefits that outshine what your base class gives you.