Interesting arguement and I guess your take on it depends on which side of the dividing line you fall.
I think a large number of PPL's are in the position of Hamish. If you consider that this year 30-40% of planned sorties out of ABZ have been cancelled due WX, I also have a job that largely eliminates midweek flying and then there are 11 of us scrambling for bookings of the group aircraft at weekends you can see how accumulating hours starts to become an issue.
The question is - does that make the lower hours pilots less safe? .... my question is why would it?
If anything I find that preparation and planning is more thorough and attention to detail meticulous if you have not flown for a while. Do a walk around with someone who has not flown for 6 weeks and someone who flies twice per week and you will see what I mean. In fact I would even say there is as much chance that complacency and over confidence in a frequent flier could compromise safety.