One side effect of "sudo bash" is that when you exit that shell your local user's .bash_history file gets overwritten by one owned by root (and un{read/write}ab

One side effect of "sudo bash" is that when you exit that shell your local user's .bash_history file gets overwritten by one owned by root (and un{read/write}able by the local user), and so your local user loses the bash history functionality from that point on.