Being unable to board a flight due to your phone battery is a potential issue I suppose - I've had that nearly happen once but fortunately with British Airways you can go to the airside customer service desk and they just print you one out. Were it Ryanair I'd have lost the flight.
But I still wouldn't have been dragged to court over it, and I'd have had the option to buy a new flight or just not go.
I suppose to be fair this like many things would be solved (mostly) by removing the strict liability Byelaw offences for rail ticketing. In that case all it should be is a Penalty Fare, which is a chunk of money but otherwise inconsequential. If I'm fined £50+fare once or twice in my life I can cope with that for the massive convenience factor of electronic ticketing (if you add the time saved up over my lifetime that's probably easily worth £100), but I don't want a criminal record, even a minor one, ever, nor are £150 settlements even remotely reasonable for this sort of situation.