I feed f/t for a few reasons.
I don't have to explain to my son about the magic disappearing mice
I don't have to breed stinky mice/rats
I can buy in bulk for dirt cheap and store them in my freezer
I can feed f/t rat and move onto the next without supervising
My brain is kind of fried, but those are my main reasons. You don't HAVE to do anything. It's a personal choice and for me f/t is just easier. Live is easier for others. I'd just hope if you chose to feed live that you did it responsibly and got all the facts before you made the decision.