It isn't a deal breaker for me, but for many it is. Once you have many animals it can get frustrating.
I have long days and bad sleep so I've occasionally completely messed up entering numbers or hit the wrong animal. The QR would help with those times. God I don't even want to admit how badly I recorded things the night I tried to feed while I had a concussion lol.
I wouldd suggest to reconsider the QR. Many people would rather use that system.