I myself is a focused melee dps. In my honest opinion, melee dps is really useful at bosses.
Also, BD does have 2 AoE, one of which has a combo with bard's burning metal. People usually overlook this.
The most important thing is that melee dps usually has much more HP, DEF, and EVA than most of other dps. (well except those who build weird dps I guess)
Furthermore, as far as I know, there are some bosses who you cannot break fast without certain break points that require melee dps. (Like some bosses with Strike, Slash, and Lightning weak points...)