As it is, I also reckon a lot of work has just gone underground which is worse than before. At least before Part P there was no risk to asking for advice - now you can't really ask publicly without risk of exposing yourself. Is it really sensible to prevent someone who is going to do the work anyway (as some will) from asking advice ?
It's only necessary to look at certain threads on this forum to see the effects of that. How many people coming here and asking about something because they are
trying to do it properly have gone away because they've been bombarded from some quarters by responses about Part P, you must notify building control, pay fees, etc?