The problem isn't making classes the same it's that with only the PHB options Pact of Blade is massively worse than the other options. I say that having DM'ed a party with one and another Pact of Tome Warlock. Hexblade fixed that by giving it a build where it's great. It's also the fix that makes the martial Bard sub class(es) not terrible. I ended up giving the Pact of Blade Warlock in my game the Hex Warrior feature (had an in story reason). Frankly PHB only 5E is so much worse than with XGtE and TGtE, I really hope PHB is not the only content we get.
Hexblade has functionally been the table top fix but it seems likely that the Wyll is going to be locked into Pact of Blade and his whole story is based on being a Fiend patron Warlock. So even including Hexblade probably means most players get to experience the full joy of Pact of Blade.
