Here's the secret about cutoff times:
if they aren't fast enough, you aren't actually saving any time.
The OH cutoffs at Guildford 2017 were posed, so let's take a look at the results:
https://www.worldcubeassociation.org/competitions/GuildfordOpen2017/results/all?event=333oh
The 1:00 cutoff affected 3 competitors. That cutoff probably saved about 1-3 minutes in the competition, when you account for the fact that the 9 solves not attempted would have probably been spread out across multiple timers, and may have been using timers that were otherwise not being utilized at the end of a group regardless. Had they used the 40 second cutoff used at a the recent Guildford competition, 14 more competitors would have been cutoff. Why did they make this adjustment? Probably because they looked at the 2017 results and realized that the community is improving, and if they wanted the cutoff to have any use, it would need to be 40 seconds.
You still get to compete in the event and be ranked even if you don't get an average as long as you can meet the time limit, which are almost always generous enough for even a beginner solver at a local competition. Back in the day, just about every competition had a best of x first round, then an average of 5 second round, so even fewer people got to get an average. People realized this was a logistical mess, and so they combined the rounds together, which led to the idea of a cutoff time, as it would be irritating to have to figure out who the top x were in a best of 2 round.
I mean this in the nicest way possible, but if you want to make cutoffs, or even second rounds, finals, cutoffs, podium, etc., you have to improve. Simple as that.