I think its time BRD get some loving

[dejavutwo]

...

Actually, the number of other party members also does not affect scaling when everything is done proportionally. The bard will still end up doing the same percentage of the boss's total HP. Two quick examples.

First - To show that even as the party scales, the bard will still do the same percentage of damage:
Melee x2: 450 dps each
Caster x1: 430 dps
Bard x1: 415 dps
Tank x2: 200 dps each
Healer x2: 50 dps each
bard is at 92% of the dps of a melee.

That brings total party dps to 2245 dps, and lets say the fight lasts 10 minutes. That brings the boss's HP to 1,347,000.
During that 10 minutes, the bard would have done 249,000 damage, which amounts to 18.5% of the boss's HP.

Lets say eveyones dps doubled. Now The melee are doing 900 dps each, while the bard is doing 830 dps. The dps difference between bard and melee grew from 35 to 70.

The new fight, the party brings 4490 dps, and the boss will now have 2,694,000 HP.
The fight again lasts 10 minutes, allowing the bard to do 498,000 damage, which again amounts to 18.5% of the boss's HP.

Second - to show what happens if the gap does not grow.
Melee: 100 dps
Bard: 80 dps

with the above numbers, the bard would do 44.4% of the boss's hp.

Scaling up melee by 2x, but keeping the bard at 2 dps below, we get
Melee: 200 dps
Bard: 180 dps

with the new numbers, the bard has begun catching up to the melee in dps and is now doing 47.4% of the boss's hp. So, if a constant offset lower is maintained, then as classes scale, that offset becomes less and less significant. In order to keep the offset relevant, it also need to be scaled at the same rate.