BC should do something specific.
What it currently does:
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gives meaningful teamwide pen on one target (maybe a bit of another as well?) after full seconds of the buyer actively fighting in a meta where teamfights last seconds...who really thinks this passive carries this item lol
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offers 20% CDR as an AD item without a high cost to justify it like Triforce
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offers movespeed that is actually used for running away from incoming ganks while farming instead of teamfighting making it the most boring part of the item
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offers cost-effective stats before the pen or movespeed passives are taken into account
These four things collectively hold the item back from being a unique item in this meta and keep it a run-of-the-mill "good on some, bad on others" item for the rest of eternity.
Three solutions: 1.) Crank up the pen and the cost, and remove Phage from the buildpath and replace it with BF Sword. 3300 and maybe increase health to 450 to further compensate. 6% pen per attack and max 30%. Now it's a pen item.
2.) Increase the cost, put Executioner's in its buildpath and give it Grievous Wounds which works well with pen. Now it's a juggerbuster.
3.) Some other third thing.