Honestly, I don't think the gap between melee and ranged/caster DPS should be that significant, but I don't think melee are as favored in Dawntrail as they were in Endwalker.

The hitboxes have been drastically reduced, and some mechanics are quite annoying for melee, so they have much more potential to lose uptime than before.
We need to wait for the stats from the savage fights to really be sure of how melee compare to ranged jobs. A few dungeons and 2 extremes are not enough to judge.

In a way, melee should have more DPS than ranged DPS, but yes, the gap should be slightly reduced.