What about airfields with noise-abatement procedures?
Put it in the AIP or on the website, or flight guide?
What about airfields like Duxford who may have regular display practice taking place?
NOTAM it, tell people over the radio, put it on the website...
What about airfields that are not attended all the time?
Who cares? The world is full of unattended airports that do not require PPR.
What about airfields with restrictions on the number of movements allowed?
I agree with this one.
Ultimately, I don't have any problem at all with PPR where there is a sensible reason; but I think in many cases, it's ridiculous and pointless.