Flying Geek
I'd echo the issues with the use of Excel, in particular, and am an advocate for well-structured databases.
My issue, as it has always been, is that electronic media is useful but has had a short history. It hasn't had time to prove itself over decades of use, and given the radical changes in the past 10-20 years in IT, I would be careful about over-reliance on any IT system still being available or usable in a year's time.
My long-time email account was scrapped with a month's notice last year because of a merger of companies. My favourite weather forecasting service was suspended last year and there are many other examples - look at the number of 'dead' links around on the web. These are due to either financial pressures or because the developers get bored and wander off elesewhere.
Pilotlog may well become one of them in due course.
Conversely, I had hours of fun looking through a wartime pilot's logbook written in neat handwriting and telling stories of great courage. To see that in an electronic output is just not the same.
So - call me a luddite, but for me it is paper-based everytime.