It would be really nice if they offered this option, especially since they are so environmently friendly. I hate wasting trees just to check to make sure the charges on my account are correct, and I like to check them daily.
I sailed Carnival last year and really enjoyed that they had kiosks where I could slide my card and check my account daily. I liked knowing where I was with my spending, without ending up with a ton of print outs.
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I'm glad they're doing this, but know a lot of people will be frustrated. Obviously as even some on this thread are.
I personally prefer to pre-pay tips. There are so many "extra" costs I never think about with a vacation so I like having that large chunk already paid for. I prepaid for our June cruise last week. Trying to cover as much of the incidental as I can.