Agreed. Hexblade has such questionable lore and far too often ends up just as a multiclass dip. This solution is far more reasonable.
Questionable lore? The concept of an evil possessed weapon is almost as old as the fantasy genre itself.
And if you play on my table I will ask you what weapon you see your character using and it will stay the same all through the game as you keep awakening its capabilities gaining more powerful traits and buffs for it. But that's not how it works in 5e. You can switch the weapon by rebinding a new one (it can even be a cursed sentient magical weapon that you pick up later...) - so the weapon isn't actually the patron but again some odd undefined power in the background. Its obvious why they did it like this because its much easier for a DM and player to deal with it, but to me its a bad representation of the lore of A possessed weapon.
To be fair though - it could also just be an artefact like in older versions and wouldn't need a warlock class bound to it - and yes, to some degree I would also accept it at my table as DM since I always let my players define what equipment they see as crucial part of their vision for their character (its up to me to balance it out).
Hexblade in 5e is sadly more prominent as multiclass dip for powergaming than something that really helps bringing the fantasy of the intented lore to the table.
