it's not broken at all. tx hashes are essential for looking up txs in the block chain, and can be used as addresses because they immutable once they are in the block chain.
before they are included in the blockchain, malleability aside, they aren't even necessarily valid (they could be double spend attempts, etc)
Because the protocol is broken with regards to tracking transactions and that has been acknowledged. Even the official implementation got it wrong. It needs to be fixed because the workaround just does not scale.