A dude in my Gw2 community group suggested this and I thought it is a great idea.
Weapon proficiency Mastery:
Mastery for each weapon type that unlocks a new skill tree to unlock with hero points that will grant you 5 new weaponskills for each profession that can wield said weapon.
Healer: As it is now
Protector: More CC based, blocks, melee range and more boons less heals.
Vanguard: As it is now
Rearguard: 1200 Ranged AoE and burn heavy.
These are just examples how they could work.
Main goal is to expand on the skill pool of each spec and increase diversity.
This could be a way to further deepen the complexity of buildcraft without slapping additional e-specs in the game.
Additionally it could give more room for weapon choices in regards of condi or power.
What do you think?