Is it safe to replace dd?

[microsoft gaofei]

Many people suggest using dd to create bootable USB, 
https://www.archlinux.org/download/ . But cp and mv also writes to USB, e.g., 
cp archlinux-2020.01.01-x86_64.iso /dev/sdb, cat 
archlinux-2020.01.01-x86_64.iso > /dev/sdb. Is it safe to use these commands 
instead of dd? If it's unsafe, I want to know the reason.