Not saying that Hexblade should be merged into Pact of Blade entirely, just that there's an imbalance in the Patron-Pact dynamic there that should probably be smoothed out a bit.
For anyone wanting to make a Pact of Blades Warlock at present, the benefits for choosing the Hexblade patron heavily outweigh those for basically any other patron. Better armor/shield options, attack with CHA, a bunch of bonus smite and defensive spells, eventually gets a 50% miss chance on attacks from their hexed target by burning reactions, etc.
I definitely think Hexblade still has a place as a subclass, but it shouldn't be so heavily weighted toward benefitting a Pact of Blades character over any other pact, and a Pact of Blades character shouldn't feel like anyè Patron other than Hexblade is a less effective option. Let Pact of Blades carry most of the weight for "weapon/melee-focused warlock" and refocus Hexblade to be primarily about the "hexes and curses" angle.