Question, why does Bard and Machinist share the same core mechanic?

[Warlyx]

mch: have +10% physical or magical vulnerability debuff 20s (120s CD) , heavy / knockback , silence/stun ,-5% dmg debuff (physical or magical share cd) , use turrets and a easy time moving thanks to ammo or procs , MP/TP regen is instant cast, disable torret attack

brd: have 10% magical only (no cd but mp limited) , can boost it to 20% ever 5 min , and has bind and silence , dispel now...MP/TP regen 3s casting time and lowers brd dmg by 20%.

oh btw Brd uses MP for FOE, MP ,TP while MCH use the mp only on MP/TP regen , the debuff is CD based no need MP at all.

correct me if im wrong :S