Another reason to use blockchain is how secure it is. Let's just say that breaching isn't easy—the distributed data model implies that the hacker will need to access thousands or millions of computers just to collect all the transaction pieces.
It's hard to overestimate how financial institutions care about security—it can be banks, currency exchange services, loan ventures—they're often targets for all sorts of malware and digital attacks. No longer do they have to pay for costly IT security departments: a reliable blockchain system is all they need. Just imagine, for February 2019, blocks can reach up to the 562,000th position of their chain after they're added to the end of the line. And even so, these new blocks have no way of knowing the previous ones thanks to their "hash" nature that consists of numbers and letters and changes every time the info inside it is edited.
So, here's what we have: even if a hacker breaches your transaction code to make you go into a panic, even after changing the payment amount, he or she will need to edit every block hash to cover the actions, because every next block will still contain the old hashes. In other words, in order to steal money, a hacker needs an impossible level of computing power just to edit the blocks, not to mention that they're non-deletable.
Another security factor is the "proof" system—it requires every connected PC to go through approval where they need to solve a complex math problem: if it manages to do so, a block is added to a chain. It's basically the "mining" process at its core—the same way people earn their money on platforms like Bitcoin by solving these "riddles," which at this moment have 1 to 5.8 trillion odds of being completed. As a result, this barrier doesn't make hacking impossible, but it becomes costly so that the attack price is no match for the possible benefits.