Fishing crates were also a bit breaking, I have often wondered what the thinking was there. You're right about the random stone thing though. But remember ore swords aren't the only thing BT will have you skipping. The Beam Sword, Cutlass, Ice Sickle, Mushroom Spear, and again, Phasesabers all get jumped for this weapon. The issue is not what in particular the BT skips, most non-ore weapons will jump you ahaed a bit. The issue is how much and when. Going from square one to up under the chin of Plantera in the space of a couple hours max is unbalanced.
The problem with Beam Sword, Ice Sickle, etc is that
they are rare drops and nobody feels like farming for hours while waiting on a decent weapon to drop. I have never thought to myself "I should get a Beam Sword/Ice Sickle/Frostbrand!"
I don't go after them, simply because they are too hard to get. And even if I do get a Bladetongue, it's usually used only in certain situations because of... *drumroll* Amarok.
Amarok does most of the heavy-lifting, while I occasionally swap to Bladetongue to handle certain situations (groups of weaker enemies).
As for Cutlass... well, that requires a Pirate attack and lately I feel that farming for maps is just too tedious and boring at least until you get a Neptune's shell.
Phaseblades are just unbalanced in the fact they are simply too weak. They are weaker than a Night's Edge and require
50 Crystal Shards and the Phasesaber (which I never make for the same reason). The only thing the Phaseblade has over the Night's Edge is that it is auto-swing. Night's Edge has significantly more knockback. So, I never used Phaseblades even before the Bladetongue's existence, lol.
To be honest, if you want to make other weapons attractive,
you need to give players a reason to go get them.
Mimics need a spawn method similar to Biome Mimics, or perhaps they should spawn a little more often in the Ice Biome (I remember one time wanting a frost brand before the Bladetongue was a thing and I spent a couple hours derping around in there with a hunter potion and.... no mimics. When I finally did see one, it dropped a stupid flower instead of the sword; that's when I gave up on actually seeking ice biome weapons 'cept amarok).
Phaseblades need a damage upgrade, perhaps 50 damage instead of a piddly 41. Perhaps 10 crystal shards instead of 50. Extra Knockback would be nice too, because weak knockback in early hardmode is NOT good when you're just starting hardmode, you need stronger knockback than that.
Ice Sickle and similar weapons need a better drop rate, or, have them drop globally like the Amarok so that it doesn't take hours of farming to get one.