In emergency situations (or even routine ones) where I'm administering morphine, I don't need a computer to help me figure out the dose. There are more complex dose calculations where good tech matters far more. Harold Thimbleby has some very accessible talks on safety in health tech: https://www.youtube.com/watch?v=AobMb3S5OtY&t=1034s
I suppose I'd better change my example to something that is more dependent on accurate weight. I do know that at one point there were weight/dose charts for morphine administration, e.g. https://nursing.duke.edu/sites/default/files/documents/SCD-O... but that could be an outdated practice.