The Xp and the PL problem are not "Fixed"

[Physic]

Or anyone who shouts for a shell and jumps immediately into said shell's PL party.

this is not the majority of people from what ive seen. If a person wants to take the express train to 50 they can, and if they dont, they dont have to, Balancing the game around that perfect scenario, will screw up the vast majority of people who dont have that scenario. By balancing it around that ultimate party, you make sure that everyone else, will have to suffer a style of play only suited to a few players