So I disagree with the OP about melee being lower in DPS, but you have to factor in two things. 1. boss AoE down time from DPSing, and 2. the rotations that melee use (they are too complex for all players and many try to do too complex for their skill level and mess it up resulting in lowered dps, or the super complex rotation does not work on boss XX due to the number of missed GCD from AoE dodging).

The one and only issue I see is in the lack of utility skills (or conditions required to use them) for melee classes. Look at turn 2 of coil, optimal silencing is done via 2 bards (high DPS, silence, songs, and mobile ranged to help moving rot around), but if other classes had a reliable of GCD silence that did not say require a specific stance I think their would be alot less 2 bard coil teams. What the game needs is other options for silence by melee classes, or simply reduce the cooldown of blunt arrow to 15sec (1/2 the time) so a single bard can do all the silencing; both options would make less likely that people would look to not bring melee. Lets be honest, one of the main reasons only one melee gets in many groups is not the DPS of them, its the better utility (which is required) of other classes. Yes 2 PLD or a PLD/BRD can do the silences, but its harder and everyone tries to build optimal easiest groups these days.