Turbine doesn't have a clue what it wants to do with it's 'endgame' or it's raid system, and it really shows in the last couple of years.
Add to that fact the hatred at least one dev has towards pale masters... let's see now... how often have they be nerfed; they lost wail; poisons and disease started affecting them... even with no way to heal stat damage... so many complaints that they are useless in EE - everyone HAS to be a stupid shiradi. Deathward bugs that leave and come back and leave and come back... shall we continue the list?
No need, it's quite obvious:
Turbine. Hates. Pale Masters.
It's the only way to be sure.
Or possibly just play the TR game, and ignore the 'endgame'.