Money is held so that interest can be earned on the float.

I am not taking about money being held, I talking about regulations and horrible banks not technology. Yes, the current technology allows you instant transfer, but it still depends on the bank. For example some banks allow free international transfers while others require a small fee, some banks you can do the transfer online while others you have to go to the branch in person. You don't have to go through a bank with crypto, sometimes it is faster and it is definitely more private.