After reading through the changes for Melee it's quite clear this is just going to be a flat nerf to Warlocks specifically, due to the fact they hold very little in terms of melee buffs. For example here is what each class holds in terms of melee damage multipliers.
Titans have 4 Aspects, 0 melees, 5 exotics. Totalling at 9 understandably the most since it's their theme
Hunters have 2 aspects, 1 melees, 4 exotics. Totalling at 7
Warlocks have 0 aspects, 0 melees, 1 exotics... No need for math here, just one.
Universally we have 2 fragments 1 exotic class item effect and two (Technically three) Weapon perks
Honestly with this entire shift to melee damage why the hell didn't we see some exotic tuning towards more melee focused exotics. A perfect example would be Felwinter's helm dealing increased melee damage to any weakened targets, or simpler still Winters guile getting the worm gods and verity treatment of a decaying buff rather than instant loss.
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It's because Bungie still seems to consider Warlocks to be the Grenadier class, even when they don't hesitate to reduce a Grenade Build's overall effectiveness if it gets too potent on Warlock. Grenades are getting a 65% damage increase if you spec into 200 Grenade for Edge of Fate, but there are a lot more perks and Exotics dedicated to buffing Melee damage than there are Grenades. Unless there's a separate TWAB for that going forward, the wide range of buffs they gave to all Melee perks and Exotics arguably power creeps Melees above Grenades, if they haven't been power-crept already. After all, it is Melee builds that were demolishing Dungeon and Raid bosses. When Starfire Protocol started running too hot in the damage-dealing department, they stripped away much of what made it powerful after Root of Nightmares. P.S. I know a lot of the perks on weapons and Exotic armor revolving around Melee are because we have both Charged and Uncharged Melee abilities to work with, but it still stands out.