Wow, I considered this topic interested because we should have clarity in the mist of sugar. You know sugar taste sweet but abuse of it can leads to diabetes. Cryptosystem is wide spread Disadvantages;
* it can be time consuming
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Why it is time-consuming?
Paying cryptocurrency is like paying from your digital wallet for some platform, you will always need an internet connection.
If both parties are ready and capable the seller can easily provide an invoice or a way to pay your payments, it's easy. Speaking of transactions getting approved, there are a lot of cryptocurrencies right now that can do this, even in Bitcoin using the lightning network.