For one, you can't undo a transaction if you made a mistake. I.e. Put in a wrong amount or sent to an incorrect address. You can't call customer service if you

For one, you can't undo a transaction if you made a mistake. I.e. Put in a wrong amount or sent to an incorrect address. You can't call customer service if you don't see your transaction. I think those are big and come with trade offs. Some others are the huge volatility of the value id bitcoin ..