Some Deals are automatic. Other deals such as X% off one order or $X for a $X purchase have to be clicked on. I suspect to make sure you don't unknowing buy a $5.00 item for your X% when you could buy more for the one order. Plus are bonus offers (eg $X off Brand X TP) that you have to add...
There's also a Circle (one-time) buy $100.00 get $15 off as well as a buy four orders of $70 or more and get $15 credit ...
Some pre-orders appeared to have come back.- though not John Wick 4 or Avatar (Original Recipe or Extra Crispy Long) ... :(