For every crypto transaction there has to be a counterparty who has to pay back in crypto, or cover a future obligation that has to be paid back in crypto.
Crypto is volatile.
So, let's say you are a buyer, and obligated to pay back in crypto (let's say, 3 Bitcoin) when the goods are cleared at the port, using standard bills of lading upon presentment, or a computerized contract (more later).
Let's say that during the good's trip on the high seas, the price of Bitcoin goes up 10%. Saying you can cover today buy buying Bitcoin today has a price of tying up your cash, and there is no certainty that the Bitcoin will be roughly the same value in the future, meaning if you do not buy the Bitcoin today, it may be higher tomorrow, or if you buy it today, you have just tied up your money in some currency,
If you have to pay someone to take that risk, you are paying money; if you have to cover that risk, you are trying up your cash.
There is something that is called freely traded currency which has few of those risks, and one's that can be covered for much less, and doesn't tie up your cash to cover the currency's volatility. It's called freely traded currency with low volatility, like the dollar, and I hear there is even a low cost futures market for it.
I am buying futures in Quantum computers which will unravel the chain and make it worthless. Let's see how long this currency fairytale lasts.
As for non-currency tasks, blockchain definitely has a future, particularly in the space called computerized contracting. https://www.investopedia.com/terms/s/smart-contracts.asp
Also, if you go bankrupt, or bankrupt a bank, don't expect you or the bank to give you assistance. You took the risk, as did your bank.