It is obvious that there is no blockchain weakness.
It's not a weakness but a feature which allows people to send (near) zero-value transactions. That makes poisoning scams cheap to carry out.
Attackers are just trying to copy or redirect the address to their own address and unfortunately they have stolen the assets of many individual users with this method. The best way to protect yourself from this attack is to send a very small amount to the address you will send to test it in my opinion.
There is no need to make test transactions as long as you take the time to verify that the destination address you are sending to is correct. And that's not a difficult thing to do. If you are sending the money to yourself, the address most be part of your wallet and not something you copied from transaction histories or blockchain explorers. If you are sending crypto to someone else, that person sent you their address in some way. Compare that source to what your wallet shows before finalizing the transaction.