Besides the use of a smart phone name one negative. There are water proof cases. So ruining your phone in the rain is out. So the negatives of digital reporting is? I don't think it should be mandatory (yet), I think any logical person can see how making it mandatory would have to many issues "I left my phone at home officer" wouldn't fly the same as "I left my license at home. But if you had both options, a CRC and an app makes much more sense.

The more people who use online immediate reporting the better in season adjustment management could make, increasing or decreasing catch limits.

Just have both.