It allows me to farm something that I harvest in the fall and buy fish in the spring.

There are a plethora of other examples but common mediums of exchange are essential to allow specialization and the society we live in.

Money allows for economic specialization, leading to greater productivity. You don't build an economy that produces cell phones when you're stuck bartering goats for wheat.

I feel like this is not answering the spirit of their question. What is bad about Crypto which isn't some nth-order effect of Money?

- When a layperson is scammed out of their Crypto the problem is that they lost Money because they used Money to buy the Crypto. (Yes, given the current ecosystem it is easier for my grandmother to be convinced to transfer all of her Crypto such that she can't get it back but that's bad because she's losing Money.)

- People are incentivized to run machines which "mine" Crypto -- but otherwise do nothing externally useful while also causing other negative externalities such as carbon emissions -- because the Crypto can be sold for Money.

Sure. I can walk into a shop anywhere in the world and exchange money (in the local currency) for goods.