TLDR at the bottom if you're lazy but please read the whole thing. Feedback is appreciated as long as it's not "This bad/dumb/lame ect.," or "You're bad/dumb/lame ect."
I think the problem most people have with banners and spirits isn't that they exist, but that they're unique. With that in mind, I thought up this.
Guardian trait Perfect Inscriptions changed to:
Healing and Elite Signets gain reduced recharge and improved passive effects. Utility Signets no longer have an activated ability, instead passively boosting 2 stats for allies within range.
Recharge Reduced: 20%
Effectiveness Increased: 20%
Utility Signet Radius: 600
Number of Allied Targets: 10
Effects do not stack with Warrior Banners
Bane Signet gives 170 Power and 170 Ferocity
Signet of Wrath gives 170 Condition Damage and 170 Precision
Signet of Mercy gives 170 Healing Power and 170 Concentration
Signet of Judgment gives 10% reduced Damage and Condition Damage taken and 170 Toughness
Engineer trait Experimental Turrets changed to:
Turrets no longer Overcharge when first placed, instead granting Boons and an additional buff to allies in the area
Healing Turret: Vigor (3s) and a chance to heal when attacking (note: would still grant regen as well)
Flame Turret: 3 Stacks of Might (10s) and a chance to Burn enemies when attacking
Rifle Turret: Fury (5s) and a chance to grant bonus damage to nearby allies
Rocket Turret: Retaliation (3s) and a chance to apply vulnerability when attacking
Thumper Turret: Protection (3s) and a chance to gain additional Protection when hit
Net Turret: Swiftness (10s) and a chance to Cripple enemies when attacking
Buff Interval: 10 seconds
Boon Radius: 600
Buff Radius: 1,000 (note: attack ranges would be unchanged)
Effects do not stack with Ranger Spirits
These changes apply to professions that already have an idea somewhat close to the unique buffs in their current traits and would enable slightly more flexibility in group comp as far as the unique buffs are concerned. I feel pretty good about the Guardian changes, as the only things you lose that might matter in PvE is the stun on Bane Signet, but Guardian has decent CC without it and could always take Hammer of Wisdom if they needed additional that badly. I'm not much of a PvPer, so I'm not sure how badly the res on Signet of Mercy would be missed, but this doesn't strike me as a PvP trait anyway. Maybe I'm wrong about that. The other issues I see is not with Guardian itself, but with Warrior potentially losing a spot in PvE because Guard gives the banner buffs with better dps. That's almost a pro though, as it could incentivize Anet to look at Warrior and make some changes instead of allowing it to stake by on the strength of it's unique buffs alone.
I'm less sure about the Engi changes, as I have very little experience with the profession. I was trying to keep the idea of the original trait as much as possible, but I'm not entirely sure these changes would be balanced. And maybe the trait would need to be swapped with something in a different line for it to work build wise? Again, not an Engi player.
TLDR: Change traits for Guardian and Engi so Signets and Turrets match, but do not stack with, the unique buffs of Warrior Banners and Ranger Spirits.