I doubt you are passing the buck - PAT is a bit like an MOT, or a CRB check. Ok on the day it was done. My own experience that the visual check catches nearly all of the fails before you even test! As most fails are very simple repairs, I suspect the system is just a good one to promote general care and maintenance. Most of my testing is the same items, one after another, and after getting pass after pass, the occasional fail does indicate a problem, so a worthwhile thing. Opening up the items has only once revealed something very nasty.
In my industry, it is very common for brought in equipment to have nice green stickers - but experience shows they were actually bought on a reel, and just peppered over dodgy kit to show how safe they are. This leads me to never ever trust a sticker. I am super zealous in my visual inspections of other people's kit in my venue (but covertly done) looking for tell tale clues. IEC mains leads with non-moulded plugs being a bit of a personal quest. Sure, they could just be old, but with moulded ones so common - is there a reason for a rewireable 13A? For many years - since the 60s really, a common trick to 'cure' a humming guitar amp, was simply to lift the earth wire in the plug. I even did it myself before ignorance was replaced with education - and the possible consequences. So now I watch for these. A plug, with a piece of coloured tape around the cable next to the cable clamp. A clue to suggest this is code for 'there's no earth on this one!". Sometimes, the tape actually hides the disconnected conductor. For me, my testing is genuinely useful, and even maybe lifesaving?
I do feel sorry for the decent testing companies, because they are in competition with dangerous people, with little knowledge. It's an uphill struggle to convince people, I guess.
You also get, of course, differences of opinion on all things safety. Only a year or so ago, somebody (a big well known company in our industry) imported a load of 15A two way adaptors (Grelcos) from China - we use these things by the bucket load! Trouble was that the factory had made them slightly smaller than the old ones they had copied - and it was possible to stick the plug in, with one pin dangling outside. Especially when doing it by touch, not sight - at the top of a ladder, in the dark, over your head. Discovering a dead light, you go up the ladder, and unplug it - touching a live pin with your hand - Not good! They had to recall thousands.