In the old contact management, there was a button for "do not mail" and another for "remove." If I wanted to remove a lot of names at once, which we do because we get a lot of spam where people sign up to our mail list with fake email addresses, I could check each one I wanted to remove. Then I would hit remove or do not mail, and they would all be removed at once.
Those buttons are not there in the new contact management. So to remove several contacts, I have to click on each one, one at a time, open them up, click on permission to send, change to "unsubscribed" then go back to the main contact page and repeat. It takes 5X as long as before. Please add back the "do not mail" and "remove" buttons like you had before.