It was a great event, and I can't praise the organisational team enough. Devising such a long route and coping with the inevitable changes forced by circumstances is obviously very challenging, and I think the organiser did a great job.
My impression is that the high DNF rate was due to inexperienced riders who didn't really understand what they were taking on, and experienced riders who were hit with tough conditions; the first day was very hot and headwind. If you didn't manage to get in a good group, riding the fens would have been very tough, and if you didn't get sufficiently far north you would have quickly been on the back foot.
In a social media world, people who would in the past never have encountered Audax, see pictures of LEL and think "That looks like an adventure. I think I'll have a crack". If you read the LEL Facebook page it was striking that a number of entrants were not only Audax novices, but cycling novices; :"What sort of bike should I get to ride this event?"
Some people had a realistic view of the outcome. I spoke to the leader of a German team of five who were reduced to two riders by the latter stages. His blunt appraisal of his DNF was "I'm 100kg and in North Germany we have no hills".
I entered LEL knowing that that it would be a challenge due to weather, terrain and distance. It certainly delivered that. The element of jeopardy is what makes it worth doing. Perhaps there's a place for a "mileage challenge" without "scenery", but I don't think that's what LEL should be. It was pretty clear what LEL would entail for anyone who actually took the time to look at the route, even before the enforced last minute Yad Moss changes.
The obvious way to reduce the DNF rate would be to introduce some form of qualification criteria, a la PBP. I can also see how that would add another administrative headache for the organising team.
Great event, great route, great value and a challenge that was worth my time.
P.S. on the subject of the "look" of the early finishers, I'm pleased to say at least 3 of the sub 100 finishers in the early hours of Wednesday were on proper bikes with mudguards!